ZyXEL Communications VMG4381B10A Wireless N VDSL2 4-port Bonding Combo WAN Gigabit Gateway with MoCA User Manual Part 2

Download:
Mirror Download [FCC.gov]
Document ID	2291793
Application ID	Yu1DAWMxaQiRLNyfTbaUNQ==
Document Description	Part 2
Short Term Confidential	No
Permanent Confidential	No
Supercede	No
Document Type	User Manual
Display Format	Adobe Acrobat PDF - pdf
Filesize	289.57kB (3619642 bits)
Date Submitted	2014-06-11 00:00:00
Date Available	2014-06-11 00:00:00
Creation Date	2014-05-20 15:08:54
Producing Software	PDF Editor 2.2 - Foxit Software
Document Lastmod	2014-05-20 15:08:54
Document Title	Part 2
Document Author:	ZT01948

Chapter 8 Home Networking
Figure 58 Network Settings > Home Networking > 5th Ethernet Port
The following table describes the fields in this screen.
Table 37 Network Settings > Home Networking > 5th Ethernet Port
LABEL
DESCRIPTION
State
Select Enable to use the Ethernet WAN port as a LAN port on the Device.
Apply
Click Apply to save your changes back to the Device.
Cancel
Click Cancel to exit this screen without saving.
8.10 The MoCA Screen
The VMG4381-B10A supports MoCA (Multimedia over Coax Alliance), which allows multimedia and
home networking over coaxial cable. Data communication and audio/video streaming are allowed at
the same time.
Click Network Settings > Home Networking > MoCA to open this screen.
Figure 59 Network Settings > Home Networking > MoCA
The following table describes the fields in this screen.
Table 38 Network Settings > Home Networking > MoCA
LABEL
DESCRIPTION
MoCA Privacy
Select the check box to enable MoCA privacy. If this is enabled, all devices
connected via coaxial cable must use the same password.
Privacy Password
Enter the password for the MoCA connection.
Enable Auto Scan
Select the check box to enable auto scan for the operating frequency.
Last Operating
Frequency
Manually select an operating frequency from the droplist.
Apply
Click Apply to save your changes back to the Device.
Cancel
Click Cancel to exit this screen without saving.
VMG4381-B10A User’s Guide
151
Chapter 8 Home Networking
8.11 The LAN VLAN Screen
Click Network Setting > Home Networking > LAN VLAN to open this screen. Use this screen to
control the VLAN ID and IEEE 802.1p priority tags of traffic sent out through individual LAN ports.
Figure 60 Network Setting > Home Networking > LAN VLAN
The following table describes the labels in this screen.
Table 39 Network Setting > Home Networking > LAN VLAN
LABEL
DESCRIPTION
Lan Port
These represent the Device’s LAN ports.
Tag Operation
Select what you want the Device to do to the IEEE 802.1q VLAN ID and priority tags of
downstream traffic before sending it out through this LAN port.
•
•
•
•
Unchange - Don’t do anything to the traffic’s VLAN ID and priority tags.
Add - Add VLAN ID and priority tags to untagged traffic.
Remove - Delete one tag from tagged traffic. If the frame has double tags, this removes
the outer tag. This does not affect untagged traffic.
Remark - Change the value of the outer VLAN ID and priority tags.
802.1P Mark
Use this option to set what to do for the IEEE 802.1p priority tags when you add or remark
the tags for a LAN port’s downstream traffic. Either select Unchange to not modify the
traffic’s priority tags or select an priority from 0 to 7 to use. The larger the number, the
higher the priority.
VLAN ID
If you will add or remark tags for this LAN port’s downstream traffic, specify the VLAN ID
(from 0 to 4094) to use here.
Apply
Click Apply to save your changes.
Cancel
Click Cancel to exit this screen without saving.
8.12 TFTP Server Name Screen
Click Network Setting > Home Networking > TFTP Server Name to open this screen. Use this
screen to access the TFTP (Trivial File Transfer Protocol) Server using DHCP option 66.
Figure 61 Network Setting > Home Networking > TFTP Server Name
VMG4381-B10A User’s Guide
152
Chapter 8 Home Networking
The following table describes the labels in this screen.
Table 40 Network Setting > Home Networking > TFTP Server Name
LABEL
DESCRIPTION
TFTP Server Name
Type a name for the TFTP Server. This allows you to access the TFTP
server using DHCP option 66. However, option 66 (open standard)
supports only the IP address of the hostname or a single TFTP server.
Apply
Click Apply to save your changes.
Cancel
Click Cancel to exit this screen without saving.
8.13 Technical Reference
This section provides some technical background information about the topics covered in this
chapter.
8.13.1 LANs, WANs and the Device
The actual physical connection determines whether the Device ports are LAN or WAN ports. There
are two separate IP networks, one inside the LAN network and the other outside the WAN network
as shown next.
Figure 62 LAN and WAN IP Addresses
LAN
WAN
8.13.2 DHCP Setup
DHCP (Dynamic Host Configuration Protocol, RFC 2131 and RFC 2132) allows individual clients to
obtain TCP/IP configuration at start-up from a server. You can configure the Device as a DHCP
server or disable it. When configured as a server, the Device provides the TCP/IP configuration for
the clients. If you turn DHCP service off, you must have another DHCP server on your LAN, or else
the computer must be manually configured.
IP Pool Setup
The Device is pre-configured with a pool of IP addresses for the DHCP clients (DHCP Pool). See the
product specifications in the appendices. Do not assign static IP addresses from the DHCP pool to
your LAN computers.
VMG4381-B10A User’s Guide
153
Chapter 8 Home Networking
8.13.3 DNS Server Addresses
DNS (Domain Name System) maps a domain name to its corresponding IP address and vice versa.
The DNS server is extremely important because without it, you must know the IP address of a
computer before you can access it. The DNS server addresses you enter when you set up DHCP are
passed to the client machines along with the assigned IP address and subnet mask.
There are two ways that an ISP disseminates the DNS server addresses.
• The ISP tells you the DNS server addresses, usually in the form of an information sheet, when
you sign up. If your ISP gives you DNS server addresses, enter them in the DNS Server fields in
the DHCP Setup screen.
• Some ISPs choose to disseminate the DNS server addresses using the DNS server extensions of
IPCP (IP Control Protocol) after the connection is up. If your ISP did not give you explicit DNS
servers, chances are the DNS servers are conveyed through IPCP negotiation. The Device
supports the IPCP DNS server extensions through the DNS proxy feature.
Please note that DNS proxy works only when the ISP uses the IPCP DNS server extensions. It
does not mean you can leave the DNS servers out of the DHCP setup under all circumstances. If
your ISP gives you explicit DNS servers, make sure that you enter their IP addresses in the
DHCP Setup screen.
8.13.4 LAN TCP/IP
The Device has built-in DHCP server capability that assigns IP addresses and DNS servers to
systems that support DHCP client capability.
IP Address and Subnet Mask
Similar to the way houses on a street share a common street name, so too do computers on a LAN
share one common network number.
Where you obtain your network number depends on your particular situation. If the ISP or your
network administrator assigns you a block of registered IP addresses, follow their instructions in
selecting the IP addresses and the subnet mask.
If the ISP did not explicitly give you an IP network number, then most likely you have a single user
account and the ISP will assign you a dynamic IP address when the connection is established. If this
is the case, it is recommended that you select a network number from 192.168.0.0 to
192.168.255.0 and you must enable the Network Address Translation (NAT) feature of the Device.
The Internet Assigned Number Authority (IANA) reserved this block of addresses specifically for
private use; please do not use any other number unless you are told otherwise. Let's say you select
192.168.1.0 as the network number; which covers 254 individual addresses, from 192.168.1.1 to
192.168.1.254 (zero and 255 are reserved). In other words, the first three numbers specify the
network number while the last number identifies an individual computer on that network.
Once you have decided on the network number, pick an IP address that is easy to remember, for
instance, 192.168.1.1, for your Device, but make sure that no other device on your network is
using that IP address.
The subnet mask specifies the network number portion of an IP address. Your Device will compute
the subnet mask automatically based on the IP address that you entered. You don't need to change
the subnet mask computed by the Device unless you are instructed to do otherwise.
VMG4381-B10A User’s Guide
154
Chapter 8 Home Networking
Private IP Addresses
Every machine on the Internet must have a unique address. If your networks are isolated from the
Internet, for example, only between your two branch offices, you can assign any IP addresses to
the hosts without problems. However, the Internet Assigned Numbers Authority (IANA) has
reserved the following three blocks of IP addresses specifically for private networks:
• 10.0.0.0
• 172.16.0.0
— 10.255.255.255
— 172.31.255.255
• 192.168.0.0 — 192.168.255.255
You can obtain your IP address from the IANA, from an ISP or it can be assigned from a private
network. If you belong to a small organization and your Internet access is through an ISP, the ISP
can provide you with the Internet addresses for your local networks. On the other hand, if you are
part of a much larger organization, you should consult your network administrator for the
appropriate IP addresses.
Note: Regardless of your particular situation, do not create an arbitrary IP address;
always follow the guidelines above. For more information on address assignment,
please refer to RFC 1597, “Address Allocation for Private Internets” and RFC 1466,
“Guidelines for Management of IP Address Space”.
VMG4381-B10A User’s Guide
155
Chapter 8 Home Networking
VMG4381-B10A User’s Guide
156
C HAPT ER
Routing
9.1 Overview
The Device usually uses the default gateway to route outbound traffic from computers on the LAN
to the Internet. To have the Device send data to devices not reachable through the default gateway,
use static routes.
For example, the next figure shows a computer (A) connected to the Device’s LAN interface. The
Device routes most traffic from A to the Internet through the Device’s default gateway (R1). You
create one static route to connect to services offered by your ISP behind router R2. You create
another static route to communicate with a separate network behind a router R3 connected to the
LAN.
Figure 63 Example of Routing Topology
R1
LAN
WAN
R3
R2
9.1.1 What You Can Do in this Chapter
• Use the Static Route screen to view and set up static routes on the Device (Section 9.2 on page
158).
• Use the Policy Forwarding screen to configure policy routing on the Device. (Section 9.3 on
page 159).
• Use the RIP screen to set up RIP settings on the Device. (Section 9.4 on page 161).
VMG4381-B10A User’s Guide
157
Chapter 9 Routing
9.2 The Routing Screen
Use this screen to view and configure the static route rules on the Device. Click Network Setting
> Routing > Static Route to open the following screen.
Figure 64 Network Setting > Routing > Static Route
The following table describes the labels in this screen.
Table 41 Network Setting > Routing > Static Route
LABEL
DESCRIPTION
Add new static
route
Click this to configure a new static route.
This is the index number of the entry.
Status
This field displays whether the static route is active or not. A yellow bulb signifies that this
route is active. A gray bulb signifies that this route is not active.
Name
This is the name that describes or identifies this route.
Destination IP
This parameter specifies the IP network address of the final destination. Routing is always
based on network number.
Subnet Mask
This parameter specifies the IP network subnet mask of the final destination.
Gateway
This is the IP address of the gateway. The gateway is a router or switch on the same
network segment as the device's LAN or WAN port. The gateway helps forward packets to
their destinations.
Interface
This is the WAN interface used for this static route.
Modify
Click the Edit icon to edit the static route on the Device.
Click the Delete icon to remove a static route from the Device. A window displays asking
you to confirm that you want to delete the route.
9.2.1 Add/Edit Static Route
Use this screen to add or edit a static route. Click Add new static route in the Routing screen or
the Edit icon next to the static route you want to edit. The screen shown next appears.
Figure 65 Routing: Add/Edit
VMG4381-B10A User’s Guide
158
Chapter 9 Routing
The following table describes the labels in this screen.
Table 42 Routing: Add/Edit
LABEL
DESCRIPTION
Active
This field allows you to activate/deactivate this static route.
Select this to enable the static route. Clear this to disable this static route without having to
delete the entry.
Route Name
Enter a descriptive name for the static route.
IP Type
Select whether your IP type is IPv4 or IPv6.
Destination IP
Address
Enter the IPv4 or IPv6 network address of the final destination.
IP Subnet Mask
If you are using IPv4 and need to specify a route to a single host, use a subnet mask of
255.255.255.255 in the subnet mask field to force the network number to be identical to
the host ID. Enter the IP subnet mask here.
Use Gateway IP
Address
The gateway is a router or switch on the same network segment as the device's LAN or WAN
port. The gateway helps forward packets to their destinations.
If you want to use the gateway IP address, select Enable.
Gateway IP
Address
Enter the IP address of the gateway.
Use Interface
Select the WAN interface you want to use for this static route.
Apply
Click Apply to save your changes.
Cancel
Click Cancel to exit this screen without saving.
9.3 The Policy Forwarding Screen
Traditionally, routing is based on the destination address only and the Device takes the shortest
path to forward a packet. Policy forwarding allows the Device to override the default routing
behavior and alter the packet forwarding based on the policy defined by the network administrator.
Policy-based routing is applied to outgoing packets, prior to the normal routing.
You can use source-based policy forwarding to direct traffic from different users through different
connections or distribute traffic among multiple paths for load sharing.
The Policy Forwarding screen let you view and configure routing policies on the Device. Click
Network Setting > Routing > Policy Forwarding to open the following screen.
Figure 66 Network Setting > Routing > Policy Forwarding
The following table describes the labels in this screen.
Table 43 Network Setting > Routing >Policy Forwarding
LABEL
DESCRIPTION
Add new Policy
Forward Rule
Click this to create a new policy forwarding rule.
This is the index number of the entry.
VMG4381-B10A User’s Guide
159
Chapter 9 Routing
Table 43 Network Setting > Routing >Policy Forwarding (continued)
LABEL
DESCRIPTION
Policy Name
This is the name of the rule.
Source IP
This is the source IP address.
Source Subnet
Mask
his is the source subnet mask address.
Protocol
This is the transport layer protocol.
Source Port
This is the source port number.
WAN
This is the WAN interface through which the traffic is routed.
Modify
Click the Edit icon to edit this policy.
Click the Delete icon to remove a policy from the Device. A window displays asking you to
confirm that you want to delete the policy.
9.3.1 Add/Edit Policy Forwarding
Click Add new Policy Forward Rule in the Policy Forwarding screen or click the Edit icon next
to a policy. Use this screen to configure the required information for a policy route.
Figure 67 Policy Forwarding: Add/Edit
The following table describes the labels in this screen.
Table 44 Policy Forwarding: Add/Edit
LABEL
DESCRIPTION
Policy Name
Enter a descriptive name of up to 8 printable English keyboard characters, not including
spaces.
Source IP
Enter the source IP address.
Source Subnet
Mask
Enter the source subnet mask address.
Protocol
Select the transport layer protocol (TCP or UDP).
Source Port
Enter the source port number.
Source MAC
Enter the source MAC address.
WAN
Select a WAN interface through which the traffic is sent. You must have the WAN
interface(s) already configured in the Broadband screens.
Apply
Click Apply to save your changes.
Cancel
Click Cancel to exit this screen without saving.
VMG4381-B10A User’s Guide
160
Chapter 9 Routing
9.4 The RIP Screen
Routing Information Protocol (RIP, RFC 1058 and RFC 1389) allows a device to exchange routing
information with other routers.
Click Network Setting > Routing > RIP to open the RIP screen.
Figure 68 RIP
The following table describes the labels in this screen.
Table 45 RIP
LABEL
DESCRIPTION
Interface
This is the name of the interface in which the RIP setting is used.
Version
The RIP version controls the format and the broadcasting method of the RIP packets that
the Device sends (it recognizes both formats when receiving). RIP version 1 is universally
supported but RIP version 2 carries more information. RIP version 1 is probably adequate
for most networks, unless you have an unusual network topology.
Operation
Select Passive to have the Device update the routing table based on the RIP packets
received from neighbors but not advertise its route information to other routers in this
interface.
Select Active to have the Device advertise its route information and also listen for routing
updates from neighboring routers.
Enabled
Select the check box to activate the settings.
Apply
Click Apply to save your changes.
Cancel
Click Cancel to exit this screen without saving.
VMG4381-B10A User’s Guide
161
Chapter 9 Routing
VMG4381-B10A User’s Guide
162
C HAPTER
10
Quality of Service (QoS)
10.1 Overview
Quality of Service (QoS) refers to both a network’s ability to deliver data with minimum delay, and
the networking methods used to control the use of bandwidth. Without QoS, all traffic data is
equally likely to be dropped when the network is congested. This can cause a reduction in network
performance and make the network inadequate for time-critical application such as video-ondemand.
Configure QoS on the Device to group and prioritize application traffic and fine-tune network
performance. Setting up QoS involves these steps:
Configure classifiers to sort traffic into different flows.
Assign priority and define actions to be performed for a classified traffic flow.
The Device assigns each packet a priority and then queues the packet accordingly. Packets assigned
a high priority are processed more quickly than those with low priority if there is congestion,
allowing time-sensitive applications to flow more smoothly. Time-sensitive applications include both
those that require a low level of latency (delay) and a low level of jitter (variations in delay) such as
Voice over IP (VoIP) or Internet gaming, and those for which jitter alone is a problem such as
Internet radio or streaming video.
This chapter contains information about configuring QoS and editing classifiers.
10.1.1 What You Can Do in this Chapter
• The General screen lets you enable or disable QoS and set the upstream bandwidth (Section
10.3 on page 165).
• The Queue Setup screen lets you configure QoS queue assignment (Section 10.4 on page 166).
• The Class Setup screen lets you add, edit or delete QoS classifiers (Section 10.5 on page 168).
• The Policer Setup screen lets you add, edit or delete QoS policers (Section 10.5 on page 168).
• The Monitor screen lets you view the Device's QoS-related packet statistics (Section 10.7 on
page 175).
VMG4381-B10A User’s Guide
163
Chapter 10 Quality of Service (QoS)
10.2 What You Need to Know
The following terms and concepts may help as you read through this chapter.
QoS versus Cos
QoS is used to prioritize source-to-destination traffic flows. All packets in the same flow are given
the same priority. CoS (class of service) is a way of managing traffic in a network by grouping
similar types of traffic together and treating each type as a class. You can use CoS to give different
priorities to different packet types.
CoS technologies include IEEE 802.1p layer 2 tagging and DiffServ (Differentiated Services or DS).
IEEE 802.1p tagging makes use of three bits in the packet header, while DiffServ is a new protocol
and defines a new DS field, which replaces the eight-bit ToS (Type of Service) field in the IP header.
Tagging and Marking
In a QoS class, you can configure whether to add or change the DSCP (DiffServ Code Point) value,
IEEE 802.1p priority level and VLAN ID number in a matched packet. When the packet passes
through a compatible network, the networking device, such as a backbone switch, can provide
specific treatment or service based on the tag or marker.
Traffic Shaping
Bursty traffic may cause network congestion. Traffic shaping regulates packets to be transmitted
with a pre-configured data transmission rate using buffers (or queues). Your Device uses the Token
Bucket algorithm to allow a certain amount of large bursts while keeping a limit at the average rate.
Traffic Rate
Traffic
Traffic
Traffic Rate
Time
Time
(After Traffic Shaping)
(Before Traffic Shaping)
VMG4381-B10A User’s Guide
164
Chapter 10 Quality of Service (QoS)
Traffic Policing
Traffic policing is the limiting of the input or output transmission rate of a class of traffic on the
basis of user-defined criteria. Traffic policing methods measure traffic flows against user-defined
criteria and identify it as either conforming, exceeding or violating the criteria.
Traffic Rate
Traffic
Traffic
Traffic Rate
Time
Time
(Before Traffic Policing)
(After Traffic Policing)
The Device supports three incoming traffic metering algorithms: Token Bucket Filter (TBF), Single
Rate Two Color Maker (srTCM), and Two Rate Two Color Marker (trTCM). You can specify actions
which are performed on the colored packets. See Section 10.8 on page 176 for more information on
each metering algorithm.
10.3 The Quality of Service General Screen
Click Network Setting > QoS > General to open the screen as shown next.
Use this screen to enable or disable QoS and set the upstream bandwidth. See Section 10.1 on
page 163 for more information.
Figure 69 Network Settings > QoS > General
VMG4381-B10A User’s Guide
165
Chapter 10 Quality of Service (QoS)
The following table describes the labels in this screen.
Table 46 Network Setting > QoS > General
LABEL
DESCRIPTION
QoS
Select the Enable check box to turn on QoS to improve your network performance.
WAN Managed
Upstream
Bandwidth
Enter the amount of upstream bandwidth for the WAN interfaces that you want to allocate
using QoS.
The recommendation is to set this speed to match the interfaces’ actual transmission speed.
For example, set the WAN interfaces’ speed to 100000 kbps if your Internet connection has
an upstream transmission speed of 100 Mbps.
You can set this number higher than the interfaces’ actual transmission speed. The Device
uses up to 95% of the DSL port’s actual upstream transmission speed even if you set this
number higher than the DSL port’s actual transmission speed.
You can also set this number lower than the interfaces’ actual transmission speed. This will
cause the Device to not use some of the interfaces’ available bandwidth.
If you leave this field blank, the Device automatically sets this number to be 95% of the
WAN interfaces’ actual upstream transmission speed.
LAN Managed
Downstream
Bandwidth
Enter the amount of downstream bandwidth for the LAN interfaces (including WLAN) that
you want to allocate using QoS.
The recommendation is to set this speed to match the WAN interfaces’ actual transmission
speed. For example, set the LAN managed downstream bandwidth to 100000 kbps if you
use a 100 Mbps wired Ethernet WAN connection.
You can also set this number lower than the WAN interfaces’ actual transmission speed. This
will cause the Device to not use some of the interfaces’ available bandwidth.
If you leave this field blank, the Device automatically sets this to the LAN interfaces’
maximum supported connection speed.
Upstream
traffic priority
Assigned by
Select how the Device assigns priorities to various upstream traffic flows.
•
•
•
•
None: Disables auto priority mapping and has the Device put packets into the queues
according to your classification rules. Traffic which does not match any of the
classification rules is mapped into the default queue with the lowest priority.
Ethernet Priority: Automatically assign priority based on the IEEE 802.1p priority level.
IP Precedence: Automatically assign priority based on the first three bits of the TOS
field in the IP header.
Packet Length: Automatically assign priority based on the packet size. Smaller packets
get higher priority since control, signaling, VoIP, internet gaming, or other real-time
packets are usually small while larger packets are usually best effort data packets like
file transfers.
Apply
Click Apply to save your changes.
Cancel
Click Cancel to restore your previously saved settings.
10.4 The Queue Setup Screen
Click Network Setting > QoS > Queue Setup to open the screen as shown next.
Use this screen to configure QoS queue assignment.
VMG4381-B10A User’s Guide
166
Chapter 10 Quality of Service (QoS)
Figure 70 Network Setting > QoS > Queue Setup
The following table describes the labels in this screen.
Table 47 Network Setting > QoS > Queue Setup
LABEL
DESCRIPTION
Add new Queue
Click this button to create a new queue entry.
This is the index number of the entry.
Status
This field displays whether the queue is active or not. A yellow bulb signifies that this queue
is active. A gray bulb signifies that this queue is not active.
Name
This shows the descriptive name of this queue.
Interface
This shows the name of the Device’s interface through which traffic in this queue passes.
Priority
This shows the priority of this queue.
Weight
This shows the weight of this queue.
Buffer
Management
This shows the queue management algorithm used for this queue.
Queue management algorithms determine how the Device should handle packets when it
receives too many (network congestion).
Rate Limit
This shows the maximum transmission rate allowed for traffic on this queue.
Modify
Click the Edit icon to edit the queue.
Click the Delete icon to delete an existing queue. Note that subsequent rules move up by
one when you take this action.
VMG4381-B10A User’s Guide
167
Chapter 10 Quality of Service (QoS)
10.4.1 Adding a QoS Queue
Click Add new Queue or the edit icon in the Queue Setup screen to configure a queue.
Figure 71 Queue Setup: Add
The following table describes the labels in this screen.
Table 48 Queue Setup: Add
LABEL
DESCRIPTION
Active
Select to enable or disable this queue.
Name
Enter the descriptive name of this queue.
Interface
Select the interface to which this queue is applied.
This field is read-only if you are editing the queue.
Priority
Select the priority level (from 1 to 7) of this queue.
The smaller the number, the higher the priority level. Traffic assigned to higher priority
queues gets through faster while traffic in lower priority queues is dropped if the network is
congested.
Weight
Select the weight (from 1 to 8) of this queue.
If two queues have the same priority level, the Device divides the bandwidth across the
queues according to their weights. Queues with larger weights get more bandwidth than
queues with smaller weights.
Buffer
Management
This field displays Drop Tail (DT). Drop Tail (DT) is a simple queue management
algorithm that allows the Device buffer to accept as many packets as it can until it is full.
Once the buffer is full, new packets that arrive are dropped until there is space in the buffer
again (packets are transmitted out of it).
Rate Limit
Specify the maximum transmission rate (in Kbps) allowed for traffic on this queue.
OK
Click OK to save your changes.
Cancel
Click Cancel to exit this screen without saving.
10.5 The Class Setup Screen
Use this screen to add, edit or delete QoS classifiers. A classifier groups traffic into data flows
according to specific criteria such as the source address, destination address, source port number,
destination port number or incoming interface. For example, you can configure a classifier to select
traffic from the same protocol port (such as Telnet) to form a flow.
VMG4381-B10A User’s Guide
168
Chapter 10 Quality of Service (QoS)
You can give different priorities to traffic that the Device forwards out through the WAN interface.
Give high priority to voice and video to make them run more smoothly. Similarly, give low priority
to many large file downloads so that they do not reduce the quality of other applications.
Click Network Setting > QoS > Class Setup to open the following screen.
Figure 72 Network Setting > QoS > Class Setup
The following table describes the labels in this screen.
Table 49 Network Setting > QoS > Class Setup
LABEL
DESCRIPTION
Add new Classifier
Click this to create a new classifier.
This is the index number of the entry.
Status
This field displays whether the classifier is active or not. A yellow bulb signifies that this
classifier is active. A gray bulb signifies that this classifier is not active.
Class Name
This is the name of the classifier.
Classification
Criteria
This shows criteria specified in this classifier, for example the interface from which
traffic of this class should come and the source MAC address of traffic that matches this
classifier.
DSCP Mark
This is the DSCP number added to traffic of this classifier.
802.1P Mark
This is the IEEE 802.1p priority level assigned to traffic of this classifier.
VLAN ID Tag
This is the VLAN ID number assigned to traffic of this classifier.
To Queue
This is the name of the queue in which traffic of this classifier is put.
Modify
Click the Edit icon to edit the classifier.
Click the Delete icon to delete an existing classifier. Note that subsequent rules move
up by one when you take this action.
10.5.1 Add/Edit QoS Class
Click Add new Classifier in the Class Setup screen or the Edit icon next to a classifier to open
the following screen.
VMG4381-B10A User’s Guide
169
Chapter 10 Quality of Service (QoS)
Figure 73 Class Setup: Add/Edit
VMG4381-B10A User’s Guide
170
Chapter 10 Quality of Service (QoS)
The following table describes the labels in this screen.
Table 50 Class Setup: Add/Edit
LABEL
DESCRIPTION
Active
Select this to enable this classifier.
Class Name
Enter a descriptive name of up to 15 printable English keyboard characters, not including
spaces.
Classification
Order
Select an existing number for where you want to put this classifier to move the classifier to
the number you selected after clicking Apply.
Select Last to put this rule in the back of the classifier list.
From Interface
If you want to classify the traffic by an ingress interface, select an interface from the From
Interface drop-down list box.
Ether Type
Select a predefined application to configure a class for the matched traffic.
If you select IP, you also need to configure source or destination MAC address, IP address,
DHCP options, DSCP value or the protocol type.
If you select 802.1Q, you can configure an 802.1p priority level.
Source
Address
Select the check box and enter the source IP address in dotted decimal notation. A blank
source IP address means any source IP address.
Subnet
Netmask
Enter the source subnet mask.
Port Range
If you select TCP or UDP in the IP Protocol field, select the check box and enter the port
number(s) of the source.
MAC
Select the check box and enter the source MAC address of the packet.
MAC Mask
Type the mask for the specified MAC address to determine which bits a packet’s MAC
address should match.
Enter “f” for each bit of the specified source MAC address that the traffic’s MAC address
should match. Enter “0” for the bit(s) of the matched traffic’s MAC address, which can be of
any hexadecimal character(s). For example, if you set the MAC address to
00:13:49:00:00:00 and the mask to ff:ff:ff:00:00:00, a packet with a MAC address of
00:13:49:12:34:56 matches this criteria.
Exclude
Select this option to exclude the packets that match the specified criteria from this classifier.
Destination
Address
Select the check box and enter the source IP address in dotted decimal notation. A blank
source IP address means any source IP address.
Subnet
Netmask
Enter the source subnet mask.
Port Range
If you select TCP or UDP in the IP Protocol field, select the check box and enter the port
number(s) of the source.
MAC
Select the check box and enter the source MAC address of the packet.
MAC Mask
Type the mask for the specified MAC address to determine which bits a packet’s MAC
address should match.
Enter “f” for each bit of the specified source MAC address that the traffic’s MAC address
should match. Enter “0” for the bit(s) of the matched traffic’s MAC address, which can be of
any hexadecimal character(s). For example, if you set the MAC address to
00:13:49:00:00:00 and the mask to ff:ff:ff:00:00:00, a packet with a MAC address of
00:13:49:12:34:56 matches this criteria.
Exclude
Select this option to exclude the packets that match the specified criteria from this classifier.
Others
VMG4381-B10A User’s Guide
171
Chapter 10 Quality of Service (QoS)
Table 50 Class Setup: Add/Edit (continued)
LABEL
Service
DESCRIPTION
This field is available only when you select IP in the Ether Type field.
This field simplifies classifier configuration by allowing you to select a predefined
application. When you select a predefined application, you do not configure the rest of the
filter fields.
IP Protocol
This field is available only when you select IP in the Ether Type field.
Select this option and select the protocol (service type) from TCP, UDP, ICMP or IGMP. If
you select User defined, enter the protocol (service type) number.
DHCP
This field is available only when you select IP in the Ether Type field.
Select this option and select a DHCP option.
If you select Vendor Class ID (DHCP Option 60), enter the Vendor Class Identifier
(Option 60) of the matched traffic, such as the type of the hardware or firmware.
If you select User Class ID (DHCP Option 77), enter a string that identifies the user’s
category or application type in the matched DHCP packets.
Packet
Length
This field is available only when you select IP in the Ether Type field.
DSCP
This field is available only when you select IP in the Ether Type field.
Select this option and enter the minimum and maximum packet length (from 46 to 1500) in
the fields provided.
Select this option and specify a DSCP (DiffServ Code Point) number between 0 and 63 in the
field provided.
802.1P
This field is available only when you select 802.1Q in the Ether Type field.
Select this option and select a priority level (between 0 and 7) from the drop-down list box.
"0" is the lowest priority level and "7" is the highest.
VLAN ID
This field is available only when you select 802.1Q in the Ether Type field.
Select this option and specify a VLAN ID number.
TCP ACK
This field is available only when you select IP in the Ether Type field.
If you select this option, the matched TCP packets must contain the ACK (Acknowledge)
flag.
Exclude
DSCP Mark
Select this option to exclude the packets that match the specified criteria from this classifier.
This field is available only when you select IP in the Ether Type field.
If you select Mark, enter a DSCP value with which the Device replaces the DSCP field in the
packets.
If you select Unchange, the Device keep the DSCP field in the packets.
802.1P Mark
Select a priority level with which the Device replaces the IEEE 802.1p priority field in the
packets.
If you select Unchange, the Device keep the 802.1p priority field in the packets.
VLAN ID
If you select Remark, enter a VLAN ID number with which the Device replaces the VLAN ID
of the frames.
If you select Remove, the Device deletes the VLAN ID of the frames before forwarding
them out.
If you select Add, the Device treat all matched traffic untagged and add a second VLAN ID.
If you select Unchange, the Device keep the VLAN ID in the packets.
Forward to
Interface
Select a WAN interface through which traffic of this class will be forwarded out. If you select
Unchange, the Device forward traffic of this class according to the default routing table.
VMG4381-B10A User’s Guide
172
Chapter 10 Quality of Service (QoS)
Table 50 Class Setup: Add/Edit (continued)
LABEL
DESCRIPTION
To Queue Index
Select a queue that applies to this class.
You should have configured a queue in the Queue Setup screen already.
Apply
Click Apply to save your changes.
Cancel
Click Cancel to exit this screen without saving.
10.6 The QoS Policer Setup Screen
Use this screen to configure QoS policers that allow you to limit the transmission rate of incoming
traffic. Click Network Setting > QoS > Policer Setup. The screen appears as shown.
Figure 74 Network Setting > QoS > Policer Setup
The following table describes the labels in this screen.
Table 51 Network Setting > QoS > Policer Setup
LABEL
DESCRIPTION
Add new Policer
Click this to create a new entry.
This is the index number of the entry.
Status
This field displays whether the policer is active or not. A yellow bulb signifies that this
policer is active. A gray bulb signifies that this policer is not active.
Name
This field displays the descriptive name of this policer.
Regulated
Classes
This field displays the name of a QoS classifier
Meter Type
This field displays the type of QoS metering algorithm used in this policer.
Rule
These are the rates and burst sizes against which the policer checks the traffic of the
member QoS classes.
Action
This shows the how the policer has the Device treat different types of traffic belonging to
the policer’s member QoS classes.
Modify
Click the Edit icon to edit the policer.
Click the Delete icon to delete an existing policer. Note that subsequent rules move up by
one when you take this action.
VMG4381-B10A User’s Guide
173
Chapter 10 Quality of Service (QoS)
10.6.1 Add/Edit a QoS Policer
Click Add new Policer in the Policer Setup screen or the Edit icon next to a policer to show the
following screen.
Figure 75 Policer Setup: Add/Edit
The following table describes the labels in this screen.
Table 52 Policer Setup: Add/Edit
LABEL
DESCRIPTION
Active
Select the check box to activate this policer.
Name
Enter the descriptive name of this policer.
Meter Type
This shows the traffic metering algorithm used in this policer.
The Simple Token Bucket algorithm uses tokens in a bucket to control when traffic can be
transmitted. Each token represents one byte. The algorithm allows bursts of up to b bytes
which is also the bucket size.
The Single Rate Three Color Marker (srTCM) is based on the token bucket filter and
identifies packets by comparing them to the Committed Information Rate (CIR), the
Committed Burst Size (CBS) and the Excess Burst Size (EBS).
The Two Rate Three Color Marker (trTCM) is based on the token bucket filter and
identifies packets by comparing them to the Committed Information Rate (CIR) and the
Peak Information Rate (PIR).
Committed
Rate
Specify the committed rate. When the incoming traffic rate of the member QoS classes is
less than the committed rate, the device applies the conforming action to the traffic.
Committed
Burst Size
Specify the committed burst size for packet bursts. This must be equal to or less than the
peak burst size (two rate three color) or excess burst size (single rate three color) if it is also
configured.
This is the maximum size of the (first) token bucket in a traffic metering algorithm.
Conforming
Action
Specify what the Device does for packets within the committed rate and burst size (greenmarked packets).
•
•
NonConforming
Action
Pass: Send the packets without modification.
DSCP Mark: Change the DSCP mark value of the packets. Enter the DSCP mark value to
use.
Specify what the Device does for packets that exceed the excess burst size or peak rate and
burst size (red-marked packets).
•
•
Drop: Discard the packets.
DSCP Mark: Change the DSCP mark value of the packets. Enter the DSCP mark value to
use. The packets may be dropped if there is congestion on the network.
VMG4381-B10A User’s Guide
174
Chapter 10 Quality of Service (QoS)
Table 52 Policer Setup: Add/Edit
LABEL
DESCRIPTION
Available Class
Select a QoS classifier to apply this QoS policer to traffic that matches the QoS classifier.
Selected Class
Highlight a QoS classifier in the Available Class box and use the > button to move it to the
Selected Class box.
To remove a QoS classifier from the Selected Class box, select it and use the < button.
Apply
Click Apply to save your changes.
Cancel
Click Cancel to exit this screen without saving.
10.7 The QoS Monitor Screen
To view the Device’s QoS packet statistics, click Network Setting > QoS > Monitor. The screen
appears as shown.
Figure 76 Network Setting > QoS > Monitor
The following table describes the labels in this screen.
Table 53 Network Setting > QoS > Monitor
LABEL
DESCRIPTION
Refresh Interval
Enter how often you want the Device to update this screen. Select No Refresh
to stop refreshing statistics.
Interface Monitor
This is the index number of the entry.
Name
This shows the name of the interface on the Device.
Pass Rate
This shows how many packets forwarded to this interface are transmitted
successfully.
Drop Rate
This shows how many packets forwarded to this interface are dropped.
Queue Monitor
This is the index number of the entry.
Name
This shows the name of the queue.
Pass Rate
This shows how many packets assigned to this queue are transmitted
successfully.
Drop Rate
This shows how many packets assigned to this queue are dropped.
VMG4381-B10A User’s Guide
175
Chapter 10 Quality of Service (QoS)
10.8 Technical Reference
The following section contains additional technical information about the Device features described
in this chapter.
IEEE 802.1Q Tag
The IEEE 802.1Q standard defines an explicit VLAN tag in the MAC header to identify the VLAN
membership of a frame across bridges. A VLAN tag includes the 12-bit VLAN ID and 3-bit user
priority. The VLAN ID associates a frame with a specific VLAN and provides the information that
devices need to process the frame across the network.
IEEE 802.1p specifies the user priority field and defines up to eight separate traffic types. The
following table describes the traffic types defined in the IEEE 802.1d standard (which incorporates
the 802.1p).
Table 54 IEEE 802.1p Priority Level and Traffic Type
PRIORITY
LEVEL
TRAFFIC TYPE
Level 7
Typically used for network control traffic such as router configuration messages.
Level 6
Typically used for voice traffic that is especially sensitive to jitter (jitter is the
variations in delay).
Level 5
Typically used for video that consumes high bandwidth and is sensitive to jitter.
Level 4
Typically used for controlled load, latency-sensitive traffic such as SNA (Systems
Network Architecture) transactions.
Level 3
Typically used for “excellent effort” or better than best effort and would include
important business traffic that can tolerate some delay.
Level 2
This is for “spare bandwidth”.
Level 1
This is typically used for non-critical “background” traffic such as bulk transfers that
are allowed but that should not affect other applications and users.
Level 0
Typically used for best-effort traffic.
DiffServ
QoS is used to prioritize source-to-destination traffic flows. All packets in the flow are given the
same priority. You can use CoS (class of service) to give different priorities to different packet
types.
DiffServ (Differentiated Services) is a class of service (CoS) model that marks packets so that they
receive specific per-hop treatment at DiffServ-compliant network devices along the route based on
the application types and traffic flow. Packets are marked with DiffServ Code Points (DSCPs)
indicating the level of service desired. This allows the intermediary DiffServ-compliant network
devices to handle the packets differently depending on the code points without the need to
negotiate paths or remember state information for every flow. In addition, applications do not have
to request a particular service or give advanced notice of where the traffic is going.
DSCP and Per-Hop Behavior
DiffServ defines a new Differentiated Services (DS) field to replace the Type of Service (TOS) field
in the IP header. The DS field contains a 2-bit unused field and a 6-bit DSCP field which can define
up to 64 service levels. The following figure illustrates the DS field.
VMG4381-B10A User’s Guide
176
Chapter 10 Quality of Service (QoS)
DSCP is backward compatible with the three precedence bits in the ToS octet so that non-DiffServ
compliant, ToS-enabled network device will not conflict with the DSCP mapping.
DSCP (6 bits)
Unused (2 bits)
The DSCP value determines the forwarding behavior, the PHB (Per-Hop Behavior), that each packet
gets across the DiffServ network. Based on the marking rule, different kinds of traffic can be
marked for different kinds of forwarding. Resources can then be allocated according to the DSCP
values and the configured policies.
IP Precedence
Similar to IEEE 802.1p prioritization at layer-2, you can use IP precedence to prioritize packets in a
layer-3 network. IP precedence uses three bits of the eight-bit ToS (Type of Service) field in the IP
header. There are eight classes of services (ranging from zero to seven) in IP precedence. Zero is
the lowest priority level and seven is the highest.
Automatic Priority Queue Assignment
If you enable QoS on the Device, the Device can automatically base on the IEEE 802.1p priority
level, IP precedence and/or packet length to assign priority to traffic which does not match a class.
The following table shows you the internal layer-2 and layer-3 QoS mapping on the Device. On the
Device, traffic assigned to higher priority queues gets through faster while traffic in lower index
queues is dropped if the network is congested.
Table 55 Internal Layer2 and Layer3 QoS Mapping
LAYER 2
LAYER 3
PRIORITY
QUEUE
IEEE 802.1P USER
PRIORITY
(ETHERNET
PRIORITY)
TOS (IP
PRECEDENCE)
DSCP
000000
000000
>1100
001110
250~1100
IP PACKET
LENGTH (BYTE)
001100
001010
001000
010110
010100
010010
010000
011110
011100
011010
011000
VMG4381-B10A User’s Guide
177
<250
Chapter 10 Quality of Service (QoS)
Table 55 Internal Layer2 and Layer3 QoS Mapping
LAYER 2
LAYER 3
PRIORITY
QUEUE
IEEE 802.1P USER
PRIORITY
(ETHERNET
PRIORITY)
TOS (IP
PRECEDENCE)
DSCP
100110
IP PACKET
LENGTH (BYTE)
100100
100010
100000
101110
101000
110000
111000
Token Bucket
The token bucket algorithm uses tokens in a bucket to control when traffic can be transmitted. The
bucket stores tokens, each of which represents one byte. The algorithm allows bursts of up to b
bytes which is also the bucket size, so the bucket can hold up to b tokens. Tokens are generated
and added into the bucket at a constant rate. The following shows how tokens work with packets:
• A packet can be transmitted if the number of tokens in the bucket is equal to or greater than the
size of the packet (in bytes).
• After a packet is transmitted, a number of tokens corresponding to the packet size is removed
from the bucket.
• If there are no tokens in the bucket, the Device stops transmitting until enough tokens are
generated.
• If not enough tokens are available, the Device treats the packet in either one of the following
ways:
In traffic shaping:
• Holds it in the queue until enough tokens are available in the bucket.
In traffic policing:
• Drops it.
• Transmits it but adds a DSCP mark. The Device may drop these marked packets if the network
is overloaded.
Configure the bucket size to be equal to or less than the amount of the bandwidth that the interface
can support. It does not help if you set it to a bucket size over the interface’s capability. The smaller
the bucket size, the lower the data transmission rate and that may cause outgoing packets to be
dropped. A larger transmission rate requires a big bucket size. For example, use a bucket size of 10
kbytes to get the transmission rate up to 10 Mbps.
Single Rate Three Color Marker
The Single Rate Three Color Marker (srTCM, defined in RFC 2697) is a type of traffic policing that
identifies packets by comparing them to one user-defined rate, the Committed Information Rate
(CIR), and two burst sizes: the Committed Burst Size (CBS) and Excess Burst Size (EBS).
VMG4381-B10A User’s Guide
178
Chapter 10 Quality of Service (QoS)
The srTCM evaluates incoming packets and marks them with one of three colors which refer to
packet loss priority levels. High packet loss priority level is referred to as red, medium is referred to
as yellow and low is referred to as green.
The srTCM is based on the token bucket filter and has two token buckets (CBS and EBS). Tokens
are generated and added into the bucket at a constant rate, called Committed Information Rate
(CIR). When the first bucket (CBS) is full, new tokens overflow into the second bucket (EBS).
All packets are evaluated against the CBS. If a packet does not exceed the CBS it is marked green.
Otherwise it is evaluated against the EBS. If it is below the EBS then it is marked yellow. If it
exceeds the EBS then it is marked red.
The following shows how tokens work with incoming packets in srTCM:
• A packet arrives. The packet is marked green and can be transmitted if the number of tokens in
the CBS bucket is equal to or greater than the size of the packet (in bytes).
• After a packet is transmitted, a number of tokens corresponding to the packet size is removed
from the CBS bucket.
• If there are not enough tokens in the CBS bucket, the Device checks the EBS bucket. The packet
is marked yellow if there are sufficient tokens in the EBS bucket. Otherwise, the packet is marked
red. No tokens are removed if the packet is dropped.
Two Rate Three Color Marker
The Two Rate Three Color Marker (trTCM, defined in RFC 2698) is a type of traffic policing that
identifies packets by comparing them to two user-defined rates: the Committed Information Rate
(CIR) and the Peak Information Rate (PIR). The CIR specifies the average rate at which packets are
admitted to the network. The PIR is greater than or equal to the CIR. CIR and PIR values are based
on the guaranteed and maximum bandwidth respectively as negotiated between a service provider
and client.
The trTCM evaluates incoming packets and marks them with one of three colors which refer to
packet loss priority levels. High packet loss priority level is referred to as red, medium is referred to
as yellow and low is referred to as green.
The trTCM is based on the token bucket filter and has two token buckets (Committed Burst Size
(CBS) and Peak Burst Size (PBS)). Tokens are generated and added into the two buckets at the CIR
and PIR respectively.
All packets are evaluated against the PIR. If a packet exceeds the PIR it is marked red. Otherwise it
is evaluated against the CIR. If it exceeds the CIR then it is marked yellow. Finally, if it is below the
CIR then it is marked green.
The following shows how tokens work with incoming packets in trTCM:
• A packet arrives. If the number of tokens in the PBS bucket is less than the size of the packet (in
bytes), the packet is marked red and may be dropped regardless of the CBS bucket. No tokens
are removed if the packet is dropped.
• If the PBS bucket has enough tokens, the Device checks the CBS bucket. The packet is marked
green and can be transmitted if the number of tokens in the CBS bucket is equal to or greater
than the size of the packet (in bytes). Otherwise, the packet is marked yellow.
VMG4381-B10A User’s Guide
179
Chapter 10 Quality of Service (QoS)
VMG4381-B10A User’s Guide
180
C HAPTER
11
Network Address Translation (NAT)
11.1 Overview
This chapter discusses how to configure NAT on the Device. NAT (Network Address Translation NAT, RFC 1631) is the translation of the IP address of a host in a packet, for example, the source
address of an outgoing packet, used within one network to a different IP address known within
another network.
11.1.1 What You Can Do in this Chapter
• Use the Port Forwarding screen to configure forward incoming service requests to the server(s)
on your local network (Section 11.2 on page 182).
• Use the Applications screen to forward incoming service requests to the server(s) on your local
network (Section 11.3 on page 185).
• Use the Port Triggering screen to add and configure the Device’s trigger port settings (Section
11.4 on page 186).
• Use the DMZ screen to configure a default server (Section 11.5 on page 189).
• Use the ALG screen to enable and disable the NAT and SIP (VoIP) ALG in the Device (Section
11.6 on page 190).
• Use the Address Mapping screen to configure the Device's address mapping settings (Section
11.7 on page 190).
11.1.2 What You Need To Know
Inside/Outside
Inside/outside denotes where a host is located relative to the Device, for example, the computers
of your subscribers are the inside hosts, while the web servers on the Internet are the outside
hosts.
Global/Local
Global/local denotes the IP address of a host in a packet as the packet traverses a router, for
example, the local address refers to the IP address of a host when the packet is in the local
network, while the global address refers to the IP address of the host when the same packet is
traveling in the WAN side.
NAT
In the simplest form, NAT changes the source IP address in a packet received from a subscriber
(the inside local address) to another (the inside global address) before forwarding the packet to the
VMG4381-B10A User’s Guide
181
Chapter 11 Network Address Translation (NAT)
WAN side. When the response comes back, NAT translates the destination address (the inside
global address) back to the inside local address before forwarding it to the original inside host.
Port Forwarding
A port forwarding set is a list of inside (behind NAT on the LAN) servers, for example, web or FTP,
that you can make visible to the outside world even though NAT makes your whole inside network
appear as a single computer to the outside world.
Finding Out More
See Section 11.8 on page 192 for advanced technical information on NAT.
11.2 The Port Forwarding Screen
Use the Port Forwarding screen to forward incoming service requests to the server(s) on your
local network.
You may enter a single port number or a range of port numbers to be forwarded, and the local IP
address of the desired server. The port number identifies a service; for example, web service is on
port 80 and FTP on port 21. In some cases, such as for unknown services or where one server can
support more than one service (for example both FTP and web service), it might be better to
specify a range of port numbers. You can allocate a server IP address that corresponds to a port or
a range of ports.
The most often used port numbers and services are shown in Appendix F on page 353. Please refer
to RFC 1700 for further information about port numbers.
Note: Many residential broadband ISP accounts do not allow you to run any server
processes (such as a Web or FTP server) from your location. Your ISP may
periodically check for servers and may suspend your account if it discovers any
active services at your location. If you are unsure, refer to your ISP.
Configuring Servers Behind Port Forwarding (Example)
Let's say you want to assign ports 21-25 to one FTP, Telnet and SMTP server (A in the example),
port 80 to another (B in the example) and assign a default server IP address of 192.168.1.35 to a
third (C in the example). You assign the LAN IP addresses and the ISP assigns the WAN IP address.
The NAT network appears as a single host on the Internet.
VMG4381-B10A User’s Guide
182
Chapter 11 Network Address Translation (NAT)
Figure 77 Multiple Servers Behind NAT Example
A=192.168.1.33
WAN
LAN
B=192.168.1.34
192.168.1.1
IP Address assigned by ISP
C=192.168.1.3
D=192.168.1.36
Click Network Setting > NAT > Port Forwarding to open the following screen.
See Appendix F on page 353 for port numbers commonly used for particular services.
Figure 78 Network Setting > NAT > Port Forwarding
The following table describes the fields in this screen.
Table 56 Network Setting > NAT > Port Forwarding
LABEL
DESCRIPTION
Add new rule
Click this to add a new rule.
This is the index number of the entry.
Status
This field displays whether the NAT rule is active or not. A yellow bulb signifies that this rule
is active. A gray bulb signifies that this rule is not active.
Service Name
This shows the service’s name.
WAN Interface
This shows the WAN interface through which the service is forwarded.
WAN IP
This field displays the incoming packet’s destination IP address.
Server IP
Address
This is the server’s IP address.
Start Port
This is the first external port number that identifies a service.
End Port
This is the last external port number that identifies a service.
Translation
Start Port
This is the first internal port number that identifies a service.
Translation End
Port
This is the last internal port number that identifies a service.
Protocol
This shows the IP protocol supported by this virtual server, whether it is TCP, UDP, or TCP/
UDP.
Modify
Click the Edit icon to edit this rule.
Click the Delete icon to delete an existing rule.
VMG4381-B10A User’s Guide
183
Chapter 11 Network Address Translation (NAT)
11.2.1 Add/Edit Port Forwarding
Click Add new rule in the Port Forwarding screen or click the Edit icon next to an existing rule to
open the following screen.
Figure 79 Port Forwarding: Add/Edit
The following table describes the labels in this screen.
Table 57 Port Forwarding: Add/Edit
LABEL
DESCRIPTION
Active
Clear the checkbox to disable the rule. Select the check box to enable it.
Service Name
Enter a name to identify this rule using keyboard characters (A-Z, a-z, 1-2 and so on).
WAN Interface
Select the WAN interface through which the service is forwarded.
You must have already configured a WAN connection with NAT enabled.
WAN IP
Enter the WAN IP address for which the incoming service is destined. If the packet’s
destination IP address doesn’t match the one specified here, the port forwarding rule will
not be applied.
Start Port
Enter the original destination port for the packets.
To forward only one port, enter the port number again in the End Port field.
To forward a series of ports, enter the start port number here and the end port number in
the End Port field.
End Port
Enter the last port of the original destination port range.
To forward only one port, enter the port number in the Start Port field above and then
enter it again in this field.
To forward a series of ports, enter the last port number in a series that begins with the port
number in the Start Port field above.
Translation
Start Port
This shows the port number to which you want the Device to translate the incoming port.
For a range of ports, enter the first number of the range to which you want the incoming
ports translated.
Translation End
Port
This shows the last port of the translated port range.
Server IP
Address
Enter the inside IP address of the virtual server here.
VMG4381-B10A User’s Guide
184
Chapter 11 Network Address Translation (NAT)
Table 57 Port Forwarding: Add/Edit (continued)
LABEL
DESCRIPTION
Protocol
Select the protocol supported by this virtual server. Choices are TCP, UDP, or TCP/UDP.
OK
Click OK to save your changes.
Cancel
Click Cancel to exit this screen without saving.
11.3 The Applications Screen
This screen provides a summary of all NAT applications and their configuration. In addition, this
screen allows you to create new applications and/or remove existing ones.
To access this screen, click Network Setting > NAT > Applications. The following screen
appears.
Figure 80 Network Setting > NAT > Applications
The following table describes the labels in this screen.
Table 58 Network Setting > NAT > Applications
LABEL
DESCRIPTION
Add new
application
Click this to add a new NAT application rule.
Application
Forwarded
This field shows the type of application that the service forwards.
WAN Interface
This field shows the WAN interface through which the service is forwarded.
Server IP
Address
This field displays the destination IP address for the service.
Modify
Click the Delete icon to delete the rule.
11.3.1 Add New Application
This screen lets you create new NAT application rules. Click Add new application in the
Applications screen to open the following screen.
VMG4381-B10A User’s Guide
185
Chapter 11 Network Address Translation (NAT)
Figure 81 Applications: Add
The following table describes the labels in this screen.
Table 59 Applications: Add
LABEL
DESCRIPTION
WAN Interface
Select the WAN interface that you want to apply this NAT rule to.
Server IP
Address
Enter the inside IP address of the application here.
Application
Category
Select the category of the application from the drop-down list box.
Application
Forwarded
Select a service from the drop-down list box and the Device automatically configures the
protocol, start, end, and map port number that define the service.
View Rule
Click this to display the configuration of the service that you have chosen in Application
Fowarded.
OK
Click OK to save your changes.
Cancel
Click Cancel to exit this screen without saving.
11.4 The Port Triggering Screen
Some services use a dedicated range of ports on the client side and a dedicated range of ports on
the server side. With regular port forwarding you set a forwarding port in NAT to forward a service
(coming in from the server on the WAN) to the IP address of a computer on the client side (LAN).
The problem is that port forwarding only forwards a service to a single LAN IP address. In order to
use the same service on a different LAN computer, you have to manually replace the LAN
computer's IP address in the forwarding port with another LAN computer's IP address.
Trigger port forwarding solves this problem by allowing computers on the LAN to dynamically take
turns using the service. The Device records the IP address of a LAN computer that sends traffic to
the WAN to request a service with a specific port number and protocol (a "trigger" port). When the
Device's WAN port receives a response with a specific port number and protocol ("open" port), the
Device forwards the traffic to the LAN IP address of the computer that sent the request. After that
computer’s connection for that service closes, another computer on the LAN can use the service in
the same manner. This way you do not need to configure a new IP address each time you want a
different LAN computer to use the application.
For example:
VMG4381-B10A User’s Guide
186
Chapter 11 Network Address Translation (NAT)
Figure 82 Trigger Port Forwarding Process: Example
Jane requests a file from the Real Audio server (port 7070).
Port 7070 is a “trigger” port and causes the Device to record Jane’s computer IP address. The
Device associates Jane's computer IP address with the "open" port range of 6970-7170.
The Real Audio server responds using a port number ranging between 6970-7170.
The Device forwards the traffic to Jane’s computer IP address.
Only Jane can connect to the Real Audio server until the connection is closed or times out. The
Device times out in three minutes with UDP (User Datagram Protocol) or two hours with TCP/IP
(Transfer Control Protocol/Internet Protocol).
Click Network Setting > NAT > Port Triggering to open the following screen. Use this screen to
view your Device’s trigger port settings.
Figure 83 Network Setting > NAT > Port Triggering
The following table describes the labels in this screen.
Table 60 Network Setting > NAT > Port Triggering
LABEL
DESCRIPTION
Add new rule
Click this to create a new rule.
This is the index number of the entry.
Status
This field displays whether the port triggering rule is active or not. A yellow bulb signifies
that this rule is active. A gray bulb signifies that this rule is not active.
Service Name
This field displays the name of the service used by this rule.
WAN Interface
This field shows the WAN interface through which the service is forwarded.
Trigger Start
Port
The trigger port is a port (or a range of ports) that causes (or triggers) the Device to record
the IP address of the LAN computer that sent the traffic to a server on the WAN.
This is the first port number that identifies a service.
Trigger End
Port
This is the last port number that identifies a service.
Trigger Proto.
This is the trigger transport layer protocol.
VMG4381-B10A User’s Guide
187
Chapter 11 Network Address Translation (NAT)
Table 60 Network Setting > NAT > Port Triggering (continued)
LABEL
DESCRIPTION
Open Start Port
The open port is a port (or a range of ports) that a server on the WAN uses when it sends
out a particular service. The Device forwards the traffic with this port (or range of ports) to
the client computer on the LAN that requested the service.
This is the first port number that identifies a service.
Open End Port
This is the last port number that identifies a service.
Open Proto.
This is the open transport layer protocol.
Modify
Click the Edit icon to edit this rule.
Click the Delete icon to delete an existing rule.
11.4.1 Add/Edit Port Triggering Rule
This screen lets you create new port triggering rules. Click Add new rule in the Port Triggering
screen or click a rule’s Edit icon to open the following screen.
Figure 84 Port Triggering: Add/Edit
The following table describes the labels in this screen.
Table 61 Port Triggering: Configuration Add/Edit
LABEL
DESCRIPTION
Active
Select the check box to enable this rule.
Service Name
Enter a name to identify this rule using keyboard characters (A-Z, a-z, 1-2 and so on).
WAN Interface
Select a WAN interface for which you want to configure port triggering rules.
Trigger Start
Port
The trigger port is a port (or a range of ports) that causes (or triggers) the Device to record
the IP address of the LAN computer that sent the traffic to a server on the WAN.
Type a port number or the starting port number in a range of port numbers.
Trigger End
Port
Type a port number or the ending port number in a range of port numbers.
Trigger Protocol
Select the transport layer protocol from TCP, UDP, or TCP/UDP.
VMG4381-B10A User’s Guide
188
Chapter 11 Network Address Translation (NAT)
Table 61 Port Triggering: Configuration Add/Edit (continued)
LABEL
DESCRIPTION
Open Start Port
The open port is a port (or a range of ports) that a server on the WAN uses when it sends
out a particular service. The Device forwards the traffic with this port (or range of ports) to
the client computer on the LAN that requested the service.
Type a port number or the starting port number in a range of port numbers.
Open End Port
Type a port number or the ending port number in a range of port numbers.
Open Protocol
Select the transport layer protocol from TCP, UDP, or TCP/UDP.
OK
Click OK to save your changes.
Cancel
Click Cancel to exit this screen without saving.
11.5 The DMZ Screen
In addition to the servers for specified services, NAT supports a default server IP address. A default
server receives packets from ports that are not specified in the NAT Port Forwarding Setup
screen.
Figure 85 Network Setting > NAT > DMZ
The following table describes the fields in this screen.
Table 62 Network Setting > NAT > DMZ
LABEL
DESCRIPTION
Default Server
Address
Enter the IP address of the default server which receives packets from ports that are not
specified in the NAT Port Forwarding screen.
Note: If you do not assign a Default Server Address, the Device discards all packets
received for ports that are not specified in the NAT Port Forwarding screen.
Apply
Click Apply to save your changes.
Cancel
Click Cancel to restore your previously saved settings.
VMG4381-B10A User’s Guide
189
Chapter 11 Network Address Translation (NAT)
11.6 The ALG Screen
Some NAT routers may include a SIP Application Layer Gateway (ALG). A SIP ALG allows SIP calls
to pass through NAT by examining and translating IP addresses embedded in the data stream.
When the Device registers with the SIP register server, the SIP ALG translates the Device’s private
IP address inside the SIP data stream to a public IP address. You do not need to use STUN or an
outbound proxy if your Device is behind a SIP ALG.
Use this screen to enable and disable the NAT and SIP (VoIP) ALG in the Device. To access this
screen, click Network Setting > NAT > ALG.
Figure 86 Network Setting > NAT > ALG
The following table describes the fields in this screen.
Table 63 Network Setting > NAT > ALG
LABEL
DESCRIPTION
NAT ALG
Enable this to make sure applications such as FTP and file transfer in IM applications work
correctly with port-forwarding and address-mapping rules.
SIP ALG
Enable this to make sure SIP (VoIP) works correctly with port-forwarding and addressmapping rules.
Apply
Click Apply to save your changes.
Cancel
Click Cancel to restore your previously saved settings.
11.7 The Address Mapping Screen
Ordering your rules is important because the Device applies the rules in the order that you specify.
When a rule matches the current packet, the Device takes the corresponding action and the
remaining rules are ignored.
Click Network Setting > NAT > Address Mapping to display the following screen.
Figure 87 Network Setting > NAT > Address Mapping
VMG4381-B10A User’s Guide
190
Chapter 11 Network Address Translation (NAT)
The following table describes the fields in this screen.
Table 64 Network Setting > NAT > Address Mapping
LABEL
DESCRIPTION
Add new rule
Click this to create a new rule.
Set
This is the index number of the address mapping set.
Local Start IP
This is the starting Inside Local IP Address (ILA).
Local End IP
This is the ending Inside Local IP Address (ILA). If the rule is for all local IP addresses, then
this field displays 0.0.0.0 as the Local Start IP address and 255.255.255.255 as the Local
End IP address. This field is blank for One-to-One mapping types.
Global Start IP
This is the starting Inside Global IP Address (IGA). Enter 0.0.0.0 here if you have a dynamic
IP address from your ISP. You can only do this for the Many-to-One mapping type.
Global End IP
This is the ending Inside Global IP Address (IGA). This field is blank for One-to-One and
Many-to-One mapping types.
Type
This is the address mapping type.
One-to-One: This mode maps one local IP address to one global IP address. Note that port
numbers do not change for the One-to-one NAT mapping type.
Many-to-One: This mode maps multiple local IP addresses to one global IP address. This is
equivalent to SUA (i.e., PAT, port address translation), the Device's Single User Account
feature that previous routers supported only.
Many-to-Many: This mode maps multiple local IP addresses to shared global IP addresses.
Modify
Click the Edit icon to go to the screen where you can edit the address mapping rule.
Click the Delete icon to delete an existing address mapping rule. Note that subsequent
address mapping rules move up by one when you take this action.
11.7.1 Add/Edit Address Mapping Rule
To add or edit an address mapping rule, click Add new rule or the rule’s edit icon in the Address
Mapping screen to display the screen shown next.
Figure 88 Address Mapping: Add/Edit
VMG4381-B10A User’s Guide
191
Chapter 11 Network Address Translation (NAT)
The following table describes the fields in this screen.
Table 65 Address Mapping: Add/Edit
LABEL
DESCRIPTION
Type
Choose the IP/port mapping type from one of the following.
One-to-One: This mode maps one local IP address to one global IP address. Note that port
numbers do not change for the One-to-one NAT mapping type.
Many-to-One: This mode maps multiple local IP addresses to one global IP address. This is
equivalent to SUA (i.e., PAT, port address translation), the Device's Single User Account
feature that previous routers supported only.
Many-to-Many: This mode maps multiple local IP addresses to shared global IP addresses.
Local Start IP
Enter the starting Inside Local IP Address (ILA).
Local End IP
Enter the ending Inside Local IP Address (ILA). If the rule is for all local IP addresses, then
this field displays 0.0.0.0 as the Local Start IP address and 255.255.255.255 as the Local
End IP address. This field is blank for One-to-One mapping types.
Global Start IP
Enter the starting Inside Global IP Address (IGA). Enter 0.0.0.0 here if you have a dynamic
IP address from your ISP. You can only do this for the Many-to-One mapping type.
Global End IP
Enter the ending Inside Global IP Address (IGA). This field is blank for One-to-One and
Many-to-One mapping types.
Set
Select the number of the mapping set for which you want to configure.
OK
Click OK to save your changes.
Cancel
Click Cancel to exit this screen without saving.
11.8 Technical Reference
This part contains more information regarding NAT.
11.8.1 NAT Definitions
Inside/outside denotes where a host is located relative to the Device, for example, the computers
of your subscribers are the inside hosts, while the web servers on the Internet are the outside
hosts.
Global/local denotes the IP address of a host in a packet as the packet traverses a router, for
example, the local address refers to the IP address of a host when the packet is in the local
network, while the global address refers to the IP address of the host when the same packet is
traveling in the WAN side.
VMG4381-B10A User’s Guide
192
Chapter 11 Network Address Translation (NAT)
Note that inside/outside refers to the location of a host, while global/local refers to the IP address
of a host used in a packet. Thus, an inside local address (ILA) is the IP address of an inside host in
a packet when the packet is still in the local network, while an inside global address (IGA) is the IP
address of the same inside host when the packet is on the WAN side. The following table
summarizes this information.
Table 66 NAT Definitions
ITEM
DESCRIPTION
Inside
This refers to the host on the LAN.
Outside
This refers to the host on the WAN.
Local
This refers to the packet address (source or destination) as the packet travels on the
LAN.
Global
This refers to the packet address (source or destination) as the packet travels on the
WAN.
NAT never changes the IP address (either local or global) of an outside host.
11.8.2 What NAT Does
In the simplest form, NAT changes the source IP address in a packet received from a subscriber
(the inside local address) to another (the inside global address) before forwarding the packet to the
WAN side. When the response comes back, NAT translates the destination address (the inside
global address) back to the inside local address before forwarding it to the original inside host. Note
that the IP address (either local or global) of an outside host is never changed.
The global IP addresses for the inside hosts can be either static or dynamically assigned by the ISP.
In addition, you can designate servers, for example, a web server and a telnet server, on your local
network and make them accessible to the outside world. If you do not define any servers (for Manyto-One and Many-to-Many Overload mapping), NAT offers the additional benefit of firewall
protection. With no servers defined, your Device filters out all incoming inquiries, thus preventing
intruders from probing your network. For more information on IP address translation, refer to RFC
1631, The IP Network Address Translator (NAT).
VMG4381-B10A User’s Guide
193
Chapter 11 Network Address Translation (NAT)
11.8.3 How NAT Works
Each packet has two addresses – a source address and a destination address. For outgoing packets,
the ILA (Inside Local Address) is the source address on the LAN, and the IGA (Inside Global
Address) is the source address on the WAN. For incoming packets, the ILA is the destination
address on the LAN, and the IGA is the destination address on the WAN. NAT maps private (local)
IP addresses to globally unique ones required for communication with hosts on other networks. It
replaces the original IP source address (and TCP or UDP source port numbers for Many-to-One and
Many-to-Many Overload NAT mapping) in each packet and then forwards it to the Internet. The
Device keeps track of the original addresses and port numbers so incoming reply packets can have
their original values restored. The following figure illustrates this.
Figure 89 How NAT Works
NAT Table
LAN
Inside Local
IP Address
192.168.1.10
192.168.1.11
192.168.1.12
192.168.1.13
192.168.1.13
192.168.1.12
SA
SA
192.168.1.10
IGA1
Inside Local
Address (ILA)
192.168.1.11
Inside Global
IP Address
IGA 1
IGA 2
IGA 3
IGA 4
WAN
Inside Global
Address (IGA)
192.168.1.10
11.8.4 NAT Application
The following figure illustrates a possible NAT application, where three inside LANs (logical LANs
using IP alias) behind the Device can communicate with three distinct WAN networks.
VMG4381-B10A User’s Guide
194
Chapter 11 Network Address Translation (NAT)
Figure 90 NAT Application With IP Alias
Port Forwarding: Services and Port Numbers
The most often used port numbers are shown in the following table. Please refer to RFC 1700 for
further information about port numbers. Please also refer to the Supporting CD for more examples
and details on port forwarding and NAT.
Table 67 Services and Port Numbers
SERVICES
PORT NUMBER
ECHO
FTP (File Transfer Protocol)
21
SMTP (Simple Mail Transfer Protocol)
25
DNS (Domain Name System)
53
Finger
79
HTTP (Hyper Text Transfer protocol or WWW, Web)
80
POP3 (Post Office Protocol)
110
NNTP (Network News Transport Protocol)
119
SNMP (Simple Network Management Protocol)
161
SNMP trap
162
PPTP (Point-to-Point Tunneling Protocol)
1723
Port Forwarding Example
Let's say you want to assign ports 21-25 to one FTP, Telnet and SMTP server (A in the example),
port 80 to another (B in the example) and assign a default server IP address of 192.168.1.35 to a
VMG4381-B10A User’s Guide
195
Chapter 11 Network Address Translation (NAT)
third (C in the example). You assign the LAN IP addresses and the ISP assigns the WAN IP address.
The NAT network appears as a single host on the Internet.
Figure 91 Multiple Servers Behind NAT Example
A=192.168.1.33
192.168.1.1
B=192.168.1.34
IP address assigned by ISP
C=192.168.1.35
D=192.168.1.36
VMG4381-B10A User’s Guide
196
C HAPTER
12
Dynamic DNS Setup
12.1 Overview
DNS
DNS (Domain Name System) is for mapping a domain name to its corresponding IP address and
vice versa. The DNS server is extremely important because without it, you must know the IP
address of a machine before you can access it.
In addition to the system DNS server(s), each WAN interface (service) is set to have its own static
or dynamic DNS server list. You can configure a DNS static route to forward DNS queries for certain
domain names through a specific WAN interface to its DNS server(s). The Device uses a system
DNS server (in the order you specify in the Broadband screen) to resolve domain names that do
not match any DNS routing entry. After the Device receives a DNS reply from a DNS server, it
creates a new entry for the resolved IP address in the routing table.
Dynamic DNS
Dynamic DNS allows you to update your current dynamic IP address with one or many dynamic
DNS services so that anyone can contact you (in NetMeeting, CU-SeeMe, etc.). You can also access
your FTP server or Web site on your own computer using a domain name (for instance
myhost.dhs.org, where myhost is a name of your choice) that will never change instead of using an
IP address that changes each time you reconnect. Your friends or relatives will always be able to
call you even if they don't know your IP address.
First of all, you need to have registered a dynamic DNS account with www.dyndns.org. This is for
people with a dynamic IP from their ISP or DHCP server that would still like to have a domain name.
The Dynamic DNS service provider will give you a password or key.
12.1.1 What You Can Do in this Chapter
• Use the DNS Entry screen to view, configure, or remove DNS routes (Section 12.2 on page
198).
• Use the Dynamic DNS screen to enable DDNS and configure the DDNS settings on the Device
(Section 12.3 on page 199).
VMG4381-B10A User’s Guide
197
Chapter 12 Dynamic DNS Setup
12.1.2 What You Need To Know
DYNDNS Wildcard
Enabling the wildcard feature for your host causes *.yourhost.dyndns.org to be aliased to the same
IP address as yourhost.dyndns.org. This feature is useful if you want to be able to use, for example,
www.yourhost.dyndns.org and still reach your hostname.
If you have a private WAN IP address, then you cannot use Dynamic DNS.
12.2 The DNS Entry Screen
Use this screen to view and configure DNS routes on the Device. Click Network Setting > DNS to
open the DNS Entry screen.
Figure 92 Network Setting > DNS > DNS Entry
The following table describes the fields in this screen.
Table 68 Network Setting > DNS > DNS Entry
LABEL
DESCRIPTION
Add new DNS
entry
Click this to create a new DNS entry.
This is the index number of the entry.
Hostname
This indicates the host name or domain name.
IP Address
This indicates the IP address assigned to this computer.
Modify
Click the Edit icon to edit the rule.
Click the Delete icon to delete an existing rule.
12.2.1 Add/Edit DNS Entry
You can manually add or edit the Device’s DNS name and IP address entry. Click Add new DNS
entry in the DNS Entry screen or the Edit icon next to the entry you want to edit. The screen
shown next appears.
VMG4381-B10A User’s Guide
198
Chapter 12 Dynamic DNS Setup
Figure 93 DNS Entry: Add/Edit
The following table describes the labels in this screen.
Table 69 DNS Entry: Add/Edit
LABEL
DESCRIPTION
Host Name
Enter the host name of the DNS entry.
IP Address
Enter the IP address of the DNS entry.
Apply
Click Apply to save your changes.
Cancel
Click Cancel to exit this screen without saving.
12.3 The Dynamic DNS Screen
Use this screen to change your Device’s DDNS. Click Network Setting > DNS > Dynamic DNS.
The screen appears as shown.
Figure 94 Network Setting > DNS > Dynamic DNS
The following table describes the fields in this screen.
Table 70 Network Setting > DNS > > Dynamic DNS
LABEL
DESCRIPTION
Dynamic DNS
Select Enable to use dynamic DNS.
Service
Provider
Select your Dynamic DNS service provider from the drop-down list box.
Hostname
Type the domain name assigned to your Device by your Dynamic DNS provider.
You can specify up to two host names in the field separated by a comma (",").
Username
Type your user name.
VMG4381-B10A User’s Guide
199
Chapter 12 Dynamic DNS Setup
Table 70 Network Setting > DNS > > Dynamic DNS (continued)
LABEL
DESCRIPTION
Password
Type the password assigned to you.
Email
If you select TZO in the Service Provider field, enter the user name you used to register
for this service.
Key
If you select TZO in the Service Provider field, enter the password you used to register for
this service.
Apply
Click Apply to save your changes.
Cancel
Click Cancel to exit this screen without saving.
VMG4381-B10A User’s Guide
200
C HAPTER
13
Interface Group
13.1 Overview
By default, all LAN and WAN interfaces on the Device are in the same group and can communicate
with each other. Create interface groups to have the Device assign the IP addresses in different
domains to different groups. Each group acts as an independent network on the Device. This lets
devices connected to an interface group’s LAN interfaces communicate through the interface
group’s WAN or LAN interfaces but not other WAN or LAN interfaces.
13.1.1 What You Can Do in this Chapter
The Interface Group screens let you create multiple networks on the Device (Section 13.2 on
page 201).
13.2 The Interface Group Screen
You can manually add a LAN interface to a new group. Alternatively, you can have the Device
automatically add the incoming traffic and the LAN interface on which traffic is received to an
interface group when its DHCP Vendor ID option information matches one listed for the interface
group.
Use the LAN screen to configure the private IP addresses the DHCP server on the Device assigns to
the clients in the default and/or user-defined groups. If you set the Device to assign IP addresses
based on the client’s DHCP Vendor ID option information, you must enable DHCP server and
configure LAN TCP/IP settings for both the default and user-defined groups. See Chapter 8 on page
133 for more information.
In the following example, the client that sends packets with the DHCP Vendor ID option set to MSFT
5.0 (meaning it is a Windows 2000 DHCP client) is assigned the IP address 192.168.2.2 and uses
the WAN VDSL_PoE/ppp0.1 interface.
VMG4381-B10A User’s Guide
201
Chapter 13 Interface Group
Figure 95 Interface Grouping Application
Default: ETH 2~4
192.168.1.x/24
eth10.0
Internet
VDSL_PoE/ppp0.1
192.168.2.x/24
DHCP Vendor ID option: MSFT 5.0
Click Network Setting > Interface Group to open the following screen.
Figure 96 Network Setting > Interface Group
The following table describes the fields in this screen.
Table 71 Network Setting > Interface Group
LABEL
DESCRIPTION
Add New
Interface Group
Click this button to create a new interface group.
Group Name
This shows the descriptive name of the group.
WAN Interface
This shows the WAN interfaces in the group.
LAN Interfaces
This shows the LAN interfaces in the group.
Criteria
This shows the filtering criteria for the group.
Modify
Click the Delete icon to remove the group.
Add
Click this button to create a new group.
13.2.1 Interface Group Configuration
Click the Add New Interface Group button in the Interface Group screen to open the following
screen. Use this screen to create a new interface group.
Note: An interface can belong to only one group at a time.
VMG4381-B10A User’s Guide
202
Chapter 13 Interface Group
Figure 97 Interface Group Configuration
The following table describes the fields in this screen.
Table 72 Interface Group Configuration
LABEL
DESCRIPTION
Group Name
Enter a name to identify this group. You can enter up to 30 characters. You can use letters,
numbers, hyphens (-) and underscores (_). Spaces are not allowed.
WAN Interface
used in the
grouping
Select the WAN interface this group uses. The group can have up to one PTM interface and
up to one ATM interface.
Grouped LAN
Interfaces
Select one or more LAN interfaces (Ethernet LAN, HPNA or wireless LAN) in the Available
LAN Interfaces list and use the left arrow to move them to the Grouped LAN Interfaces
list to add the interfaces to this group.
Available LAN
Interfaces
Select None to not add a WAN interface to this group.
To remove a LAN or wireless LAN interface from the Grouped LAN Interfaces, use the
right-facing arrow.
Automatically
Add Clients
With the
following DHCP
Vendor IDs
Click Add to identify LAN hosts to add to the interface group by criteria such as the type of
the hardware or firmware. See Section 13.2.2 on page 204 for more information.
This shows the index number of the rule.
Filter Criteria
This shows the filtering criteria. The LAN interface on which the matched traffic is received
will belong to this group automatically.
WildCard
Support
This shows if wildcard on DHCP option 60 is enabled.
Remove
Click the Remove icon to delete this rule from the Device.
VMG4381-B10A User’s Guide
203
Chapter 13 Interface Group
Table 72 Interface Group Configuration (continued)
LABEL
DESCRIPTION
Apply
Click Apply to save your changes back to the Device.
Cancel
Click Cancel to exit this screen without saving.
13.2.2 Interface Grouping Criteria
Click the Add button in the Interface Grouping Configuration screen to open the following
screen.
Figure 98 Interface Grouping Criteria
The following table describes the fields in this screen.
Table 73 Interface Grouping Criteria
LABEL
DESCRIPTION
Source MAC
Address
Enter the source MAC address of the packet.
DHCP Option
60
Select this option and enter the Vendor Class Identifier (Option 60) of the matched traffic,
such as the type of the hardware or firmware.
Enable
wildcard on
DHCP
option 60
option
DHCP Option
61
IAID
Select this option to be able to use wildcards in the Vendor Class Identifier configured for
DHCP option 60.
Select this and enter the device identity of the matched traffic.
Enter the Identity Association Identifier (IAID) of the device, for example, the WAN
connection index number.
VMG4381-B10A User’s Guide
204
Chapter 13 Interface Group
Table 73 Interface Grouping Criteria (continued)
LABEL
DUID type
DESCRIPTION
Select DUID-LLT (DUID Based on Link-layer Address Plus Time) to enter the hardware
type, a time value and the MAC address of the device.
Select DUID-EN (DUID Assigned by Vendor Based upon Enterprise Number) to enter the
vendor’s registered enterprise number.
Select DUID-LL (DUID Based on Link-layer Address) to enter the device’s hardware type
and hardware address (MAC address) in the following fields.
Select Other to enter any string that identifies the device in the DUID field.
DHCP Option
125
Select this and enter vendor specific information of the matched traffic.
Enterprise
Number
Enter the vendor’s 32-bit enterprise number registered with the IANA (Internet Assigned
Numbers Authority).
Manufactur
er OUI
Specify the vendor’s OUI (Organization Unique Identifier). It is usually the first three bytes
of the MAC address.
Product
Class
Enter the product class of the device.
Model
Name
Enter the model name of the device.
Serial
Number
Enter the serial number of the device.
Apply
Click Apply to save your changes back to the Device.
Cancel
Click Cancel to exit this screen without saving.
VMG4381-B10A User’s Guide
205
Chapter 13 Interface Group
VMG4381-B10A User’s Guide
206
C HAPTER
14
USB Service
14.1 Overview
The Device has a USB port used to share files via a USB memory stick or a USB hard drive. In the
USB Service screens, you can enable file-sharing server, media server, and printer server.
14.1.1 What You Can Do in this Chapter
• Use the File Sharing screen to enable file-sharing server (Section 14.2 on page 208).
• Use the Media Server screen to enable or disable the sharing of media files (Section 14.3 on
page 210).
• Use the Printer Server screen to enable the print server (Section 14.4 on page 211).
14.1.2 What You Need To Know
The following terms and concepts may help as you read this chapter.
14.1.2.1 About File Sharing
Workgroup name
This is the name given to a set of computers that are connected on a network and share resources
such as a printer or files. Windows automatically assigns the workgroup name when you set up a
network.
Shares
When settings are set to default, each USB device connected to the Device is given a folder, called
a “share”. If a USB hard drive connected to the Device has more than one partition, then each
partition will be allocated a share. You can also configure a “share” to be a sub-folder or file on the
USB device.
File Systems
A file system is a way of storing and organizing files on your hard drive and storage device. Often
different operating systems such as Windows or Linux have different file systems. The file sharing
feature on your Device supports File Allocation Table (FAT) and FAT32.
Common Internet File System
The Device uses Common Internet File System (CIFS) protocol for its file sharing functions. CIFS
compatible computers can access the USB file storage devices connected to the Device. CIFS
VMG4381-B10A User’s Guide
207
Chapter 14 USB Service
protocol is supported on Microsoft Windows, Linux Samba and other operating systems (refer to
your systems specifications for CIFS compatibility).
14.1.2.2 About Printer Server
Print Server
This is a computer or other device which manages one or more printers, and which sends print jobs
to each printer from the computer itself or other devices.
Operating System
An operating system (OS) is the interface which helps you manage a computer. Common examples
are Microsoft Windows, Mac OS or Linux.
TCP/IP
TCP/IP (Transmission Control Protocol/ Internet Protocol) is a set of communications protocols that
most of the Internet runs on.
Port
A port maps a network service such as http to a process running on your computer, such as a
process run by your web browser. When traffic from the Internet is received on your computer, the
port number is used to identify which process running on your computer it is intended for.
Supported OSs
Your operating system must support TCP/IP ports for printing and be compatible with the RAW (port
9100) protocol.
The following OSs support Device’s printer sharing feature.
• Microsoft Windows 95, Windows 98 SE (Second Edition), Windows Me, Windows NT 4.0, Windows
2000, Windows XP or Macintosh OS X.
14.2 The File Sharing Screen
You can share files on a USB memory stick or hard drive connected to your Device with users on
your network.
The following figure is an overview of the Device’s file server feature. Computers A and B can
access files on a USB device (C) which is connected to the Device.
VMG4381-B10A User’s Guide
208
Chapter 14 USB Service
Figure 99 File Sharing Overview
The Device will not be able to join the workgroup if your local area network has restrictions
set up that do not allow devices to join a workgroup. In this case, contact your network
administrator.
14.2.1 Before You Begin
Make sure the Device is connected to your network and turned on.
Connect the USB device to one of the Device’s USB port. Make sure the Device is connected to your
network.
The Device detects the USB device and makes its contents available for browsing. If you are
connecting a USB hard drive that comes with an external power supply, make sure it is connected
to an appropriate power source that is on.
Note: If your USB device cannot be detected by the Device, see the troubleshooting for
suggestions.
Use this screen to set up file sharing using the Device. To access this screen, click Network
Setting > USB Service > File Sharing.
Figure 100 Network Setting > USB Service > File Sharing
VMG4381-B10A User’s Guide
209
Chapter 14 USB Service
Each field is described in the following table.
Table 74 Network Setting > Home Networking > File Sharing
LABEL
DESCRIPTION
File Sharing
Services
Select Enable to activate file sharing through the Device.
Host Name
Enter the host name on the share.
Apply
Click Apply to save your changes.
Cancel
Click Cancel to restore your previously saved settings.
14.3 The Media Server Screen
The media server feature lets anyone on your network play video, music, and photos from the USB
storage device connected to your Device (without having to copy them to another computer). The
Device can function as a DLNA-compliant media server. The Device streams files to DLNA-compliant
media clients (like Windows Media Player). The Digital Living Network Alliance (DLNA) is a group of
personal computer and electronics companies that works to make products compatible in a home
network.
The Device media server enables you to:
• Publish all shares for everyone to play media files in the USB storage device connected to the
Device.
• Use hardware-based media clients like the DMA-2500 to play the files.
Note: Anyone on your network can play the media files in the published shares. No user
name and password or other form of security is used. The media server is enabled
by default with the video, photo, and music shares published.
To change your Device’s media server settings, click Network Setting > USB Service > Media
Server. The screen appears as shown.
Figure 101 Network Setting > USB Service > Media Server
VMG4381-B10A User’s Guide
210
Chapter 14 USB Service
The following table describes the labels in this menu.
Table 75 Network Setting > USB Service > Media Server
LABEL
DESCRIPTION
Media Server
Select Enable to have the Device function as a DLNA-compliant media server.
Enable the media server to let (DLNA-compliant) media clients on your network play media
files located in the shares.
Apply
Click Apply to save your changes.
Cancel
Click Cancel to restore your previously saved settings.
14.4 The Printer Server Screen
The Device allows you to share a USB printer on your LAN. You can do this by connecting a USB
printer to one of the USB ports on the Device and then adding the printer on the computers
connected to your network. See Section 4.11 on page 62 for instructions on adding a printer on
your computer.
Figure 102 Sharing a USB Printer
14.4.1 Before You Begin
To configure the print server you need the following:
• Your Device must be connected to your computer and any other devices on your network. The
USB printer must be connected to your Device.
• A USB printer with the driver already installed on your computer.
• See Section 4.11 on page 62 for instructions on adding a printer on your computer.
Note: Your printer’s installation instructions may ask that you connect the printer to your
computer. Connect your printer to the Device instead.
Use this screen to enable or disable sharing of a USB printer via your Device.
To access this screen, click Network Setting > USB Service > Printer Server.
VMG4381-B10A User’s Guide
211
Chapter 14 USB Service
Figure 103 Network Setting > USB Service > Printer Server
The following table describes the labels in this menu.
Table 76 Network Setting > USB Service > Print Server
LABEL
DESCRIPTION
Printer Server
Select Enable to have the Device share a USB printer.
Printer Name
Enter the name of the printer.
Make and
model
Enter the manufacturer and model number of the printer.
Apply
Click Apply to save your changes.
Cancel
Click Cancel to restore your previously saved settings.
VMG4381-B10A User’s Guide
212
C HAPTER
15
Firewall
15.1 Overview
This chapter shows you how to enable and configure the Device’s security settings. Use the firewall
to protect your Device and network from attacks by hackers on the Internet and control access to
it. By default the firewall:
• allows traffic that originates from your LAN computers to go to all other networks.
• blocks traffic that originates on other networks from going to the LAN.
The following figure illustrates the default firewall action. User A can initiate an IM (Instant
Messaging) session from the LAN to the WAN (1). Return traffic for this session is also allowed (2).
However other traffic initiated from the WAN is blocked (3 and 4).
Figure 104 Default Firewall Action
WAN
LAN
15.1.1 What You Can Do in this Chapter
• Use the General screen to configure the security level of the firewall on the Device (Section 15.2
on page 215).
• Use the Service screen to add or remove predefined Internet services and configure firewall
rules (Section 15.3 on page 215).
• Use the Access Control screen to view and configure incoming/outgoing filtering rules (Section
15.4 on page 217).
• Use the DoS screen to activate protection against Denial of Service (DoS) attacks (Section 15.5
on page 220).
VMG4381-B10A User’s Guide
213
Chapter 15 Firewall
15.1.2 What You Need to Know
SYN Attack
A SYN attack floods a targeted system with a series of SYN packets. Each packet causes the
targeted system to issue a SYN-ACK response. While the targeted system waits for the ACK that
follows the SYN-ACK, it queues up all outstanding SYN-ACK responses on a backlog queue. SYNACKs are moved off the queue only when an ACK comes back or when an internal timer terminates
the three-way handshake. Once the queue is full, the system will ignore all incoming SYN requests,
making the system unavailable for legitimate users.
DoS
Denials of Service (DoS) attacks are aimed at devices and networks with a connection to the
Internet. Their goal is not to steal information, but to disable a device or network so users no longer
have access to network resources. The ZyXEL Device is pre-configured to automatically detect and
thwart all known DoS attacks.
DDoS
A DDoS attack is one in which multiple compromised systems attack a single target, thereby
causing denial of service for users of the targeted system.
LAND Attack
In a LAND attack, hackers flood SYN packets into the network with a spoofed source IP address of
the target system. This makes it appear as if the host computer sent the packets to itself, making
the system unavailable while the target system tries to respond to itself.
Ping of Death
Ping of Death uses a "ping" utility to create and send an IP packet that exceeds the maximum
65,536 bytes of data allowed by the IP specification. This may cause systems to crash, hang or
reboot.
SPI
Stateful Packet Inspection (SPI) tracks each connection crossing the firewall and makes sure it is
valid. Filtering decisions are based not only on rules but also context. For example, traffic from the
WAN may only be allowed to cross the firewall in response to a request from the LAN.
VMG4381-B10A User’s Guide
214
Chapter 15 Firewall
15.2 The Firewall Screen
Use this screen to set the security level of the firewall on the Device. Firewall rules are grouped
based on the direction of travel of packets to which they apply.
Click Security > Firewall to display the General screen.
Figure 105 Security > Firewall > General
The following table describes the labels in this screen.
Table 77 Security > Firewall > General
LABEL
DESCRIPTION
Firewall
Select Enable to activate the firewall feature on the Device.
Easy
Select Easy to allow LAN to WAN and WAN to LAN packet directions.
Medium
Select Medium to allow LAN to WAN but deny WAN to LAN packet directions.
High
Select High to deny LAN to WAN and WAN to LAN packet directions.
Apply
Click Apply to save your changes.
Cancel
Click Cancel to restore your previously saved settings.
15.3 The Service Screen
You can configure customized services and port numbers in the Service screen. For a
comprehensive list of port numbers and services, visit the IANA (Internet Assigned Number
Authority) website. See Appendix F on page 353 for some examples. This screen is not applicable to
VMG4381.
Click Security > Firewall > Service to display the following screen.
Figure 106 Security > Firewall > Service
VMG4381-B10A User’s Guide
215
Chapter 15 Firewall
The following table describes the labels in this screen.
Table 78 Security > Firewall > Service
LABEL
DESCRIPTION
Add new
service entry
Click this to add a new service.
Name
This is the name of your customized service.
Description
This is the description of your customized service.
Ports/Protocol
Number
This shows the IP protocol (TCP, UDP, ICMP, or TCP/UDP) and the port number or range
of ports that defines your customized service. Other and the protocol number displays if the
service uses another IP protocol.
Modify
Click the Edit icon to edit the entry.
Click the Delete icon to remove this entry.
15.3.1 Add/Edit a Service
Use this screen to add a customized service rule that you can use in the firewall’s ACL rule
configuration. Click Add new service entry or the edit icon next to an existing service rule in the
Service screen to display the following screen.
Figure 107 Service: Add/Edit
VMG4381-B10A User’s Guide
216
Chapter 15 Firewall
The following table describes the labels in this screen.
Table 79 Service: Add/Edit
LABEL
DESCRIPTION
Protocol
Choose the IP protocol (TCP, UDP, ICMP, or Other) that defines your customized port from
the drop-down list box. Select Other to be able to enter a protocol number.
Source/
These fields are displayed if you select TCP or UDP as the IP port.
Destination Port
Select Single to specify one port only or Range to specify a span of ports that define your
customized service. If you select Any, the service is applied to all ports.
Type a single port number or the range of port numbers that define your customized
service.
Protocol
Number
This field is displayed if you select Other as the protocol.
Add
Click this to add the protocol to the Rule List below.
Enter the protocol number of your customized port.
Rule List
Protocol
This is the IP port (TCP, UDP, ICMP, or Other) that defines your customized port.
Ports/Protocol
Number
For TCP, UDP, ICMP, or TCP/UDP protocol rules this shows the port number or range that
defines the custom service. For other IP protocol rules this shows the protocol number.
Modify
Click the Delete icon to remove the rule.
Service Name
Enter a unique name (up to 32 printable English keyboard characters, including spaces) for
your customized port.
Service
Description
Enter a description for your customized port.
Apply
Click Apply to save your changes.
Cancel
Click Cancel to exit this screen without saving.
15.4 The Access Control Screen
Click Security > Firewall > Access Control to display the following screen. This screen displays a
list of the configured incoming or outgoing filtering rules.
Figure 108 Security > Firewall > Access Control
VMG4381-B10A User’s Guide
217
Chapter 15 Firewall
The following table describes the labels in this screen.
Table 80 Security > Firewall > Access Control
LABEL
DESCRIPTION
DoS Protection
DoS (Denial of Service) attacks can flood your Internet connection with invalid packets and
connection requests, using so much bandwidth and so many resources that Internet access
becomes unavailable.
Select the Enable check box to enable protection against DoS attacks.
Add new ACL
rule
Click this to go to add a filter rule for incoming or outgoing IP traffic.
This is the index number of the entry.
Name
This displays the name of the rule.
Src IP
This displays the source IP addresses to which this rule applies. Please note that a blank
source address is equivalent to Any.
Dst IP
This displays the destination IP addresses to which this rule applies. Please note that a
blank destination address is equivalent to Any.
Service
This displays the transport layer protocol that defines the service and the direction of traffic
to which this rule applies.
Action
This field displays whether the rule silently discards packets (DROP), discards packets and
sends a TCP reset packet or an ICMP destination-unreachable message to the sender
(REJECT) or allows the passage of packets (ACCEPT).
Modify
Click the Edit icon to edit the rule.
Click the Delete icon to delete an existing rule. Note that subsequent rules move up by one
when you take this action.
Click the Move To icon to change the order of the rule. Enter the number in the # field.
15.4.1 Add/Edit an ACL Rule
Click Add new ACL rule or the Edit icon next to an existing ACL rule in the Access Control
screen. The following screen displays.
VMG4381-B10A User’s Guide
218
Chapter 15 Firewall
Figure 109 Access Control: Add/Edit
The following table describes the labels in this screen.
Table 81 Access Control: Add/Edit
LABEL
DESCRIPTION
Filter Name
Enter a descriptive name of up to 16 alphanumeric characters, not including spaces,
underscores, and dashes.
You must enter the filter name to add an ACL rule. This field is read-only if you are editing
the ACL rule.
Order
Select the order of the ACL rule.
Select Source
Device
Select the source device to which the ACL rule applies. If you select Specific IP Address,
enter the source IP address in the field below.
Source IP
Address
Enter the source IP address.
Select
Destination
Device
Select the destination device to which the ACL rule applies. If you select Specific IP
Address, enter the destiniation IP address in the field below.
Destination IP
Address
Enter the destination IP address.
IP Type
Select whether your IP type is IPv4 or IPv6.
Select Protocol
Select the transport layer protocol that defines your customized port from the drop-down
list box. The specific protocol rule sets you add in the Security > Firewall > Service >
Add screen display in this list.
If you want to configure a customized protocol, select Specific Service.
VMG4381-B10A User’s Guide
219
Chapter 15 Firewall
Table 81 Access Control: Add/Edit (continued)
LABEL
DESCRIPTION
Protocol
This field is displayed only when you select Specific Protocol in Select Protocol.
Choose the IP port (TCP/UDP, TCP, UDP, ICMP, or ICMPv6) that defines your customized
port from the drop-down list box.
Custom Source
Port
This field is displayed only when you select Specific Protocol in Select Protocol.
Enter a single port number or the range of port numbers of the source.
Custom
This field is displayed only when you select Specific Protocol in Select Protocol.
Destination Port
Enter a single port number or the range of port numbers of the destination.
Policy
Use the drop-down list box to select whether to discard (DROP), deny and send an ICMP
destination-unreachable message to the sender of (REJECT) or allow the passage of
(ACCEPT) packets that match this rule.
Direction
Use the drop-down list box to select the direction of traffic to which this rule applies.
Enable Rate
Limit
Select this check box to set a limit on the upstream/downstream transmission rate for the
specified protocol.
Specify how many packets per minute or second the transmission rate is.
Scheduler Rules Select a schedule rule for this ACL rule form the drop-down list box. You can configure a
new schedule rule by click Add New Rule. This will bring you to the Security > Scheduler
Rules screen.
Apply
Click Apply to save your changes.
Cancel
Click Cancel to exit this screen without saving.
15.5 The DoS Screen
DoS (Denial of Service) attacks can flood your Internet connection with invalid packets and
connection requests, using so much bandwidth and so many resources that Internet access
becomes unavailable.
Use the DoS screen to activate protection against DoS attacks. Click Security > Firewall > DoS
to display the following screen.
Figure 110 Security > Firewall > DoS
VMG4381-B10A User’s Guide
220
Chapter 15 Firewall
The following table describes the labels in this screen.
Table 82 Security > Firewall > DoS
LABEL
DESCRIPTION
DoS Protection
Blocking
Select Enable to enable protection against DoS attacks.
Deny Ping
Response
Select Enable to block ping request packets.
Apply
Click Apply to save your changes.
Cancel
Click Cancel to exit this screen without saving.
VMG4381-B10A User’s Guide
221
Chapter 15 Firewall
VMG4381-B10A User’s Guide
222
C HAPTER
16
MAC Filter
16.1 Overview
You can configure the Device to permit access to clients based on their MAC addresses in the MAC
Filter screen. This applies to wired and wireless connections. Every Ethernet device has a unique
MAC (Media Access Control) address. The MAC address is assigned at the factory and consists of six
pairs of hexadecimal characters, for example, 00:A0:C5:00:00:02. You need to know the MAC
addresses of the devices to configure this screen.
VMG4381-B10A User’s Guide
223
Chapter 16 MAC Filter
16.2 The MAC Filter Screen
Use this screen to allow wireless and LAN clients access to the Device. Click Security > MAC Filter.
The screen appears as shown.
Figure 111 Security > MAC Filter
The following table describes the labels in this screen.
Table 83 Security > MAC Filter
LABEL
DESCRIPTION
MAC Address Filter
Select Enable to activate the MAC filter function.
Set
This is the index number of the MAC address.
Allow
Select Allow to permit access to the Device. MAC addresses not listed will be denied
access to the Device.
If you clear this, the MAC Address field for this set clears.
Host name
Enter the host name of the wireless or LAN clients that are allowed access to the
Device.
MAC Address
Enter the MAC addresses of the wireless or LAN clients that are allowed access to the
Device in these address fields. Enter the MAC addresses in a valid MAC address format,
that is, six hexadecimal character pairs, for example, 12:34:56:78:9a:bc.
VMG4381-B10A User’s Guide
224
Chapter 16 MAC Filter
Table 83 Security > MAC Filter (continued)
LABEL
DESCRIPTION
Apply
Click Apply to save your changes.
Cancel
Click Cancel to restore your previously saved settings.
VMG4381-B10A User’s Guide
225
Chapter 16 MAC Filter
VMG4381-B10A User’s Guide
226
C HAPTER
17
Parental Control
17.1 Overview
Parental control allows you to block web sites with the specific URL. You can also define time
periods and days during which the Device performs parental control on a specific user.
17.2 The Parental Control Screen
Use this screen to enable parental control, view the parental control rules and schedules.
Click Security > Parental Control to open the following screen.
Figure 112 Security > Parental Control
The following table describes the fields in this screen.
Table 84 Security > Parental Control
LABEL
DESCRIPTION
Parental
Control
Select Enable to activate parental control.
Add new PCP
Click this if you want to configure a new parental control rule.
This shows the index number of the rule.
Status
This indicates whether the rule is active or not.
A yellow bulb signifies that this rule is active. A gray bulb signifies that this rule is not active.
PCP Name
This shows the name of the rule.
Home Network
User (MAC)
This shows the MAC address of the LAN user’s computer to which this rule applies.
VMG4381-B10A User’s Guide
227
Chapter 17 Parental Control
Table 84 Security > Parental Control (continued)
LABEL
DESCRIPTION
Internet Access
Schedule
This shows the day(s) and time on which parental control is enabled.
Network
Service
This shows whether the network service is configured. If not, None will be shown.
Website Block
This shows whether the website block is configured. If not, None will be shown.
Modify
Click the Edit icon to go to the screen where you can edit the rule.
Click the Delete icon to delete an existing rule.
Apply
Click Apply to save your changes.
Cancel
Click Cancel to restore your previously saved settings.
17.2.1 Add/Edit a Parental Control Rule
Click Add new PCP in the Parental Control screen to add a new rule or click the Edit icon next to
an existing rule to edit it. Use this screen to configure a restricted access schedule and/or URL
filtering settings to block the users on your network from accessing certain web sites.
Figure 113 Parental Control Rule: Add/Edit
VMG4381-B10A User’s Guide
228
Chapter 17 Parental Control
The following table describes the fields in this screen.
Table 85 Parental Control Rule: Add/Edit
LABEL
DESCRIPTION
General
Active
Select the checkbox to activate this parental control rule.
Parental
Control Profile
Name
Enter a descriptive name for the rule.
Home Network
User
Select the LAN user that you want to apply this rule to from the drop-down list box. If you
select Custom, enter the LAN user’s MAC address. If you select All, the rule applies to all
LAN users.
Internet Access Schedule
Day
Select check boxes for the days that you want the Device to perform parental control.
Time
Drag the time bar to define the time that the LAN user is allowed access.
Network Service
Network
Service Setting
If you select Block, the Device prohibits the users from viewing the Web sites with the URLs
listed below.
If you select Allow, the Device blocks access to all URLs except ones listed below.
Add new
service
Click this to show a screen in which you can add a new service rule. You can configure the
Service Name, Protocol, and Name of the new rule.
This shows the index number of the rule. Select the checkbox next to the rule to activate it.
Service Name
This shows the name of the rule.
Protocol:Port
This shows the protocol and the port of the rule.
Modify
Click the Edit icon to go to the screen where you can edit the rule.
Click the Delete icon to delete an existing rule.
Blocked Site/
URL Keyword
Click Add to show a screen to enter the URL of web site or URL keyword to which the Device
blocks access. Click Delete to remove it.
Apply
Click this button to save your settings back to the Device.
Cancel
Click Cancel to restore your previously saved settings.
VMG4381-B10A User’s Guide
229
Chapter 17 Parental Control
VMG4381-B10A User’s Guide
230
C HAPTER
18
Scheduler Rules
18.1 Overview
You can define time periods and days during which the Device performs scheduled rules of certain
features (such as Firewall Access Control, Parental Control) on a specific user in the Scheduler Rules
screen.
18.2 The Scheduler Rules Screen
Use this screen to view, add, or edit time schedule rules.
Click Security > Scheduler Rules to open the following screen.
Figure 114 Security > Scheduler Rules
The following table describes the fields in this screen.
Table 86 Security > Scheduler Rules
LABEL
DESCRIPTION
Add new rule
Click this to create a new rule.
This is the index number of the entry.
Rule Name
This shows the name of the rule.
Day
This shows the day(s) on which this rule is enabled.
Time
This shows the period of time on which this rule is enabled.
Description
This shows the description of this rule.
Modify
Click the Edit icon to edit the schedule.
Click the Delete icon to delete a scheduler rule.
Note: You cannot delete a scheduler rule once it is applied to a certain feature.
18.2.1 Add/Edit a Schedule
Click the Add button in the Scheduler Rules screen or click the Edit icon next to a schedule rule
to open the following screen. Use this screen to configure a restricted access schedule for a specific
user on your network.
VMG4381-B10A User’s Guide
231
Chapter 18 Scheduler Rules
Figure 115 Scheduler Rules: Add/Edit
The following table describes the fields in this screen.
Table 87 Scheduler Rules: Add/Edit
LABEL
DESCRIPTION
Rule Name
Enter a name (up to 31 printable English keyboard characters, not including spaces) for this
schedule.
Day
Select check boxes for the days that you want the Device to perform this scheduler rule.
Time if Day
Range
Enter the time period of each day, in 24-hour format, during which parental control will be
enforced.
Description
Enter a description for this scheduler rule.
Apply
Click Apply to save your changes.
Cancel
Click Cancel to exit this screen without saving.
VMG4381-B10A User’s Guide
232
C HAPTER
19
Certificates
19.1 Overview
The Device can use certificates (also called digital IDs) to authenticate users. Certificates are based
on public-private key pairs. A certificate contains the certificate owner’s identity and public key.
Certificates provide a way to exchange public keys for use in authentication.
19.1.1 What You Can Do in this Chapter
• The Local Certificates screen lets you generate certification requests and import the Device's
CA-signed certificates (Section 19.4 on page 237).
• The Trusted CA screen lets you save the certificates of trusted CAs to the Device (Section 19.4
on page 237).
19.2 What You Need to Know
The following terms and concepts may help as you read through this chapter.
Certification Authority
A Certification Authority (CA) issues certificates and guarantees the identity of each certificate
owner. There are commercial certification authorities like CyberTrust or VeriSign and government
certification authorities. The certification authority uses its private key to sign certificates. Anyone
can then use the certification authority's public key to verify the certificates. You can use the Device
to generate certification requests that contain identifying information and public keys and then send
the certification requests to a certification authority.
19.3 The Local Certificates Screen
Click Security > Certificates to open the Local Certificates screen. This is the Device’s summary
list of certificates and certification requests.
VMG4381-B10A User’s Guide
233
Chapter 19 Certificates
Figure 116 Security > Certificates > Local Certificates
The following table describes the labels in this screen.
Table 88 Security > Certificates > Local Certificates
LABEL
DESCRIPTION
Private Key is
protected by a
password?
Select the checkbox and enter the private key into the text box to store it on the Device.
The private key should not exceed 63 ASCII characters (not including spaces).
Browse...
Click this to find the certificate file you want to upload.
Import Certificate
Click this button to save the certificate that you have enrolled from a certification
authority from your computer to the Device.
Create Certificate
Request
Click this button to go to the screen where you can have the Device generate a
certification request.
Current File
This field displays the name used to identify this certificate. It is recommended that you
give each certificate a unique name.
Subject
This field displays identifying information about the certificate’s owner, such as CN
(Common Name), OU (Organizational Unit or department), O (Organization or company)
and C (Country). It is recommended that each certificate have unique subject
information.
Issuer
This field displays identifying information about the certificate’s issuing certification
authority, such as a common name, organizational unit or department, organization or
company and country.
Valid From
This field displays the date that the certificate becomes applicable. The text displays in
red and includes a Not Yet Valid! message if the certificate has not yet become
applicable.
Valid To
This field displays the date that the certificate expires. The text displays in red and
includes an Expiring! or Expired! message if the certificate is about to expire or has
already expired.
Modify
Click the View icon to open a screen with an in-depth list of information about the
certificate (or certification request).
For a certification request, click Load Signed to import the signed certificate.
Click the Remove icon to delete the certificate (or certification request). You cannot
delete a certificate that one or more features is configured to use.
19.3.1 Create Certificate Request
Click Security > Certificates > Local Certificates and then Create Certificate Request to
open the following screen. Use this screen to have the Device generate a certification request.
VMG4381-B10A User’s Guide
234
Chapter 19 Certificates
Figure 117 Create Certificate Request
The following table describes the labels in this screen.
Table 89 Create Certificate Request
LABEL
DESCRIPTION
Certificate
Name
Type up to 63 ASCII characters (not including spaces) to identify this certificate.
Common Name
Select Auto to have the Device configure this field automatically. Or select Customize to
enter it manually.
Type the IP address (in dotted decimal notation), domain name or e-mail address in the field
provided. The domain name or e-mail address can be up to 63 ASCII characters. The
domain name or e-mail address is for identification purposes only and can be any string.
Organization
Name
Type up to 63 characters to identify the company or group to which the certificate owner
belongs. You may use any character, including spaces, but the Device drops trailing spaces.
State/Province
Name
Type up to 32 characters to identify the state or province where the certificate owner is
located. You may use any character, including spaces, but the Device drops trailing spaces.
Country/Region
Name
Select a country to identify the nation where the certificate owner is located.
Apply
Click Apply to save your changes.
Cancel
Click Cancel to exit this screen without saving.
After you click Apply, the following screen displays to notify you that you need to get the certificate
request signed by a Certificate Authority. If you already have, click Load_Signed to import the
signed certificate into the Device. Otherwise click Back to return to the Local Certificates screen.
VMG4381-B10A User’s Guide
235
Chapter 19 Certificates
Figure 118 Certificate Request Created
19.3.2 Load Signed Certificate
After you create a certificate request and have it signed by a Certificate Authority, in the Local
Certificates screen click the certificate request’s Load Signed icon to import the signed certificate
into the Device.
Note: You must remove any spaces from the certificate’s filename before you can import
it.
Figure 119 Load Signed Certificate
VMG4381-B10A User’s Guide
236
Chapter 19 Certificates
The following table describes the labels in this screen.
Table 90 Load Signed Certificate
LABEL
DESCRIPTION
Certificate
Name
This is the name of the signed certificate.
Certificate
Copy and paste the signed certificate into the text box to store it on the Device.
Apply
Click Apply to save your changes.
Cancel
Click Cancel to exit this screen without saving.
19.4 The Trusted CA Screen
Click Security > Certificates > Trusted CA to open the following screen. This screen displays a
summary list of certificates of the certification authorities that you have set the Device to accept as
trusted. The Device accepts any valid certificate signed by a certification authority on this list as
being trustworthy; thus you do not need to import any certificate that is signed by one of these
certification authorities.
Figure 120 Security > Certificates > Trusted CA
The following table describes the fields in this screen.
Table 91 Security > Certificates > Trusted CA
LABEL
DESCRIPTION
Import
Certificate
Click this button to open a screen where you can save the certificate of a certification
authority that you trust to the Device.
This is the index number of the entry.
Name
This field displays the name used to identify this certificate.
Subject
This field displays information that identifies the owner of the certificate, such as Common
Name (CN), OU (Organizational Unit or department), Organization (O), State (ST) and
Country (C). It is recommended that each certificate have unique subject information.
Type
This field displays general information about the certificate. ca means that a Certification
Authority signed the certificate.
Modify
Click the View icon to open a screen with an in-depth list of information about the
certificate (or certification request).
Click the Remove button to delete the certificate (or certification request). You cannot
delete a certificate that one or more features is configured to use.
19.4.1 View Trusted CA Certificate
Click the View icon in the Trusted CA screen to open the following screen. Use this screen to view
in-depth information about the certification authority’s certificate.
VMG4381-B10A User’s Guide
237
Chapter 19 Certificates
Figure 121 Trusted CA: View
The following table describes the fields in this screen.
Table 92 Trusted CA: View
LABEL
DESCRIPTION
Name
This field displays the identifying name of this certificate.
Type
This field displays general information about the certificate. ca means that a Certification
Authority signed the certificate.
Subject
This field displays information that identifies the owner of the certificate, such as Common
Name (CN), Organizational Unit (OU), Organization (O) and Country (C).
Certificate
This read-only text box displays the certificate in Privacy Enhanced Mail (PEM) format. PEM
uses base 64 to convert the binary certificate into a printable form.
You can copy and paste the certificate into an e-mail to send to friends or colleagues or you
can copy and paste the certificate into a text editor and save the file on a management
computer for later distribution (via floppy disk for example).
Back
Click Back to return to the previous screen.
19.4.2 Import Trusted CA Certificate
Click the Import Certificate button in the Trusted CA screen to open the following screen. The
Device trusts any valid certificate signed by any of the imported trusted CA certificates.
VMG4381-B10A User’s Guide
238
Chapter 19 Certificates
Figure 122 Trusted CA: Import Certificate
The following table describes the fields in this screen.
Table 93 Trusted CA: Import Certificate
LABEL
DESCRIPTION
Certificate File
Path
Type in the location of the certificate you want to upload in this field or click Browse ... to
find it.
Enable Trusted
CA for 802.1x
Authentication
If you select this checkbox, the trusted CA will be used for 802.1x authentication. The
selected trusted CA will be displayed in the Network Setting > Broadband > 802.1x:
Edit screen.
Certificate
Copy and paste the certificate into the text box to store it on the Device.
OK
Click OK to save your changes.
Cancel
Click Cancel to exit this screen without saving.
VMG4381-B10A User’s Guide
239
Chapter 19 Certificates
VMG4381-B10A User’s Guide
240
C HAPTER
20
Log
20.1 Overview
The web configurator allows you to choose which categories of events and/or alerts to have the
Device log and then display the logs or have the Device send them to an administrator (as e-mail)
or to a syslog server.
20.1.1 What You Can Do in this Chapter
• Use the System Log screen to see the system logs (Section 20.2 on page 242).
• Use the Security Log screen to see the security-related logs for the categories that you select
(Section 20.3 on page 243).
20.1.2 What You Need To Know
The following terms and concepts may help as you read this chapter.
Alerts and Logs
An alert is a type of log that warrants more serious attention. They include system errors, attacks
(access control) and attempted access to blocked web sites. Some categories such as System
Errors consist of both logs and alerts. You may differentiate them by their color in the View Log
screen. Alerts display in red and logs display in black.
Syslog Overview
The syslog protocol allows devices to send event notification messages across an IP network to
syslog servers that collect the event messages. A syslog-enabled device can generate a syslog
message and send it to a syslog server.
Syslog is defined in RFC 3164. The RFC defines the packet format, content and system log related
information of syslog messages. Each syslog message has a facility and severity level. The syslog
facility identifies a file in the syslog server. Refer to the documentation of your syslog program for
details. The following table describes the syslog severity levels.
Table 94 Syslog Severity Levels
CODE
SEVERITY
Emergency: The system is unusable.
Alert: Action must be taken immediately.
Critical: The system condition is critical.
Error: There is an error condition on the system.
Warning: There is a warning condition on the system.
VMG4381-B10A User’s Guide
241
Chapter 20 Log
Table 94 Syslog Severity Levels
CODE
SEVERITY
Notice: There is a normal but significant condition on the system.
Informational: The syslog contains an informational message.
Debug: The message is intended for debug-level purposes.
20.2 The System Log Screen
Use the System Log screen to see the system logs. Click System Monitor > Log to open the
System Log screen.
Figure 123 System Monitor > Log > System Log
The following table describes the fields in this screen.
Table 95 System Monitor > Log > System Log
LABEL
DESCRIPTION
Level
Select a severity level from the drop-down list box. This filters search results according to
the severity level you have selected. When you select a severity, the Device searches
through all logs of that severity or higher.
Category
Select the type of logs to display.
Clear Log
Click this to delete all the logs.
Refresh
Click this to renew the log screen.
Export Log
Click this to export the selected log(s).
Email Log Now
Click this to send the log file(s) to the E-mail address you specify in the Maintenance >
Logs Setting screen.
System Log
This field is a sequential value and is not associated with a specific entry.
Time
This field displays the time the log was recorded.
Facility
The log facility allows you to send logs to different files in the syslog server. Refer to the
documentation of your syslog program for more details.
Level
This field displays the severity level of the logs that the device is to send to this syslog
server.
Messages
This field states the reason for the log.
VMG4381-B10A User’s Guide
242
Chapter 20 Log
20.3 The Security Log Screen
Use the Security Log screen to see the security-related logs for the categories that you select.
Click System Monitor > Log > Security Log to open the following screen.
Figure 124 System Monitor > Log > Security Log
The following table describes the fields in this screen.
Table 96 System Monitor > Log > Security Log
LABEL
DESCRIPTION
Level
Select a severity level from the drop-down list box. This filters search results according to
the severity level you have selected. When you select a severity, the Device searches
through all logs of that severity or higher.
Category
Select the type of logs to display.
Clear Log
Click this to delete all the logs.
Refresh
Click this to renew the log screen.
Export Log
Click this to export the selected log(s).
Email Log Now
Click this to send the log file(s) to the E-mail address you specify in the Maintenance >
Logs Setting screen.
This field is a sequential value and is not associated with a specific entry.
Time
This field displays the time the log was recorded.
Facility
The log facility allows you to send logs to different files in the syslog server. Refer to the
documentation of your syslog program for more details.
Level
This field displays the severity level of the logs that the device is to send to this syslog
server.
Messages
This field states the reason for the log.
VMG4381-B10A User’s Guide
243
Chapter 20 Log
VMG4381-B10A User’s Guide
244
C HAPTER
21
Traffic Status
21.1 Overview
Use the Traffic Status screens to look at network traffic status and statistics of the WAN and LAN
interfaces.
21.1.1 What You Can Do in this Chapter
• Use the WAN screen to view the WAN traffic statistics (Section 21.2 on page 245).
• Use the LAN screen to view the LAN traffic statistics (Section 21.3 on page 246).
21.2 The WAN Status Screen
Click System Monitor > Traffic Status to open the WAN screen. The figure in this screen shows
the number of bytes received and sent on the Device.
Figure 125 System Monitor > Traffic Status > WAN
VMG4381-B10A User’s Guide
245
Chapter 21 Traffic Status
The following table describes the fields in this screen.
Table 97 System Monitor > Traffic Status > WAN
LABEL
DESCRIPTION
Connected
Interface
This shows the name of the WAN interface that is currently connected.
Packets Sent
Data
This indicates the number of transmitted packets on this interface.
Error
This indicates the number of frames with errors transmitted on this interface.
Drop
This indicates the number of outgoing packets dropped on this interface.
Packets Received
Data
This indicates the number of received packets on this interface.
Error
This indicates the number of frames with errors received on this interface.
Drop
This indicates the number of received packets dropped on this interface.
more...hide
more
Click more... to show more information. Click hide more to hide them.
Disabled
Interface
This shows the name of the WAN interface that is currently disconnected.
Packets Sent
Data
This indicates the number of transmitted packets on this interface.
Error
This indicates the number of frames with errors transmitted on this interface.
Drop
This indicates the number of outgoing packets dropped on this interface.
Packets Received
Data
This indicates the number of received packets on this interface.
Error
This indicates the number of frames with errors received on this interface.
Drop
This indicates the number of received packets dropped on this interface.
21.3 The LAN Status Screen
Click System Monitor > Traffic Status > LAN to open the following screen. The figure in this
screen shows the interface that is currently connected on the Device.
Figure 126 System Monitor > Traffic Status > LAN
The following table describes the fields in this screen.
Table 98 System Monitor > Traffic Status > LAN
LABEL
DESCRIPTION
Refresh Interval
Select how often you want the Device to update this screen.
Interface
This shows the LAN or WLAN interface.
Bytes Sent
This indicates the number of bytes transmitted on this interface.
VMG4381-B10A User’s Guide
246
Chapter 21 Traffic Status
Table 98 System Monitor > Traffic Status > LAN (continued)
LABEL
DESCRIPTION
more...hide
more
Click more... to show more information. Click hide more to hide them.
Interface
This shows the LAN or WLAN interface.
Sent (Packets)
Data
This indicates the number of transmitted packets on this interface.
Error
This indicates the number of frames with errors transmitted on this interface.
Drop
This indicates the number of outgoing packets dropped on this interface.
Received (Packets)
Data
This indicates the number of received packets on this interface.
Error
This indicates the number of frames with errors received on this interface.
Drop
This indicates the number of received packets dropped on this interface.
VMG4381-B10A User’s Guide
247
Chapter 21 Traffic Status
VMG4381-B10A User’s Guide
248
C HAPTER
22
ARP Table
22.1 Overview
Address Resolution Protocol (ARP) is a protocol for mapping an Internet Protocol address (IP
address) to a physical machine address, also known as a Media Access Control or MAC address, on
the local area network.
An IP (version 4) address is 32 bits long. In an Ethernet LAN, MAC addresses are 48 bits long. The
ARP Table maintains an association between each MAC address and its corresponding IP address.
22.1.1 How ARP Works
When an incoming packet destined for a host device on a local area network arrives at the device,
the device's ARP program looks in the ARP Table and, if it finds the address, sends it to the device.
If no entry is found for the IP address, ARP broadcasts the request to all the devices on the LAN.
The device fills in its own MAC and IP address in the sender address fields, and puts the known IP
address of the target in the target IP address field. In addition, the device puts all ones in the target
MAC field (FF.FF.FF.FF.FF.FF is the Ethernet broadcast address). The replying device (which is either
the IP address of the device being sought or the router that knows the way) replaces the broadcast
address with the target's MAC address, swaps the sender and target pairs, and unicasts the answer
directly back to the requesting machine. ARP updates the ARP Table for future reference and then
sends the packet to the MAC address that replied.
22.2 ARP Table Screen
Use the ARP table to view IP-to-MAC address mapping(s). To open this screen, click System
Monitor > ARP Table.
Figure 127 System Monitor > ARP Table
The following table describes the labels in this screen.
Table 99 System Monitor > ARP Table
LABEL
DESCRIPTION
This is the ARP table entry number.
IP Address
This is the learned IP address of a device connected to a port.
VMG4381-B10A User’s Guide
249
Chapter 22 ARP Table
Table 99 System Monitor > ARP Table (continued)
LABEL
DESCRIPTION
MAC Address
This is the MAC address of the device with the listed IP address.
Device
This is the type of interface used by the device. You can click on the device type to go to its
configuration screen.
VMG4381-B10A User’s Guide
250
C HAPTER
23
Routing Table
23.1 Overview
Routing is based on the destination address only and the Device takes the shortest path to forward
a packet.
23.2 The Routing Table Screen
Click System Monitor > Routing Table to open the following screen.
Figure 128 System Monitor > Routing Table
The following table describes the labels in this screen.
Table 100 System Monitor > Routing Table
LABEL
DESCRIPTION
Destination
This indicates the destination IP address of this route.
Gateway
This indicates the IP address of the gateway that helps forward this route’s traffic.
Subnet Mask
This indicates the destination subnet mask of this route.
Flag
This indicates the route status.
U-Up: The route is up.
!-Reject: The route is blocked and will force a route lookup to fail.
G-Gateway: The route uses a gateway to forward traffic.
H-Host: The target of the route is a host.
R-Reinstate: The route is reinstated for dynamic routing.
D-Dynamic (redirect): The route is dynamically installed by a routing daemon or redirect.
M-Modified (redirect): The route is modified from a routing daemon or redirect.
Metric
The metric represents the "cost of transmission". A router determines the best route for
transmission by choosing a path with the lowest "cost". The smaller the number, the lower
the "cost".
VMG4381-B10A User’s Guide
251
Chapter 23 Routing Table
Table 100 System Monitor > Routing Table (continued)
LABEL
DESCRIPTION
Service
This indicates the name of the service used to forward the route.
Interface
This indicates the name of the interface through which the route is forwarded.
br0 indicates the LAN interface.
ptm0 indicates the WAN interface using IPoE or in bridge mode.
ppp0 indicates the WAN interface using PPPoE.
VMG4381-B10A User’s Guide
252
C HAPTER
24
IGMP Status
24.1 Overview
Use the IGMP Status screens to look at IGMP group status and traffic statistics.
24.2 The IGMP Group Status Screen
Use this screen to look at the current list of multicast groups the Device has joined and which ports
have joined it. To open this screen, click System Monitor > IGMP Group Status.
Figure 129 System Monitor > IGMP Group Status
The following table describes the labels in this screen.
Table 101 System Monitor > IGMP Group Status
LABEL
DESCRIPTION
Interface
This field displays the name of an interface on the Device that belongs to an IGMP multicast
group.
Multicast Group
This field displays the name of the IGMP multicast group to which the interface belongs.
Filter Mode
INCLUDE means that only the IP addresses in the Source List get to receive the multicast
group’s traffic.
EXCLUDE means that the IP addresses in the Source List are not allowed to receive the
multicast group’s traffic but other IP addresses can.
Source List
This is the list of IP addresses that are allowed or not allowed to receive the multicast
group’s traffic depending on the filter mode.
VMG4381-B10A User’s Guide
253
Chapter 24 IGMP Status
VMG4381-B10A User’s Guide
254
C HAPTER
25
xDSL Statistics
25.1 The xDSL Statistics Screen
Use this screen to view detailed DSL statistics. Click System Monitor > xDSL Statistics to open
the following screen.
Figure 130 System Monitor > xDSL Statistics
VMG4381-B10A User’s Guide
255
Chapter 25 xDSL Statistics
The following table describes the labels in this screen.
Table 102 Status > xDSL Statistics
LABEL
DESCRIPTION
Refresh Interval
Select the time interval for refreshing statistics.
Line
Select which DSL line’s statistics you want to display.
xDSL Training
Status
This displays the current state of setting up the DSL connection.
Mode
This displays the ITU standard used for this connection.
Traffic Type
This displays the type of traffic the DSL port is sending and receiving. Inactive displays if
the DSL port is not currently sending or receiving traffic.
Link Uptime
This displays how long the port has been running (or connected) since the last time it was
started.
xDSL Port Details
Upstream
These are the statistics for the traffic direction going out from the port to the service
provider.
Downstream
These are the statistics for the traffic direction coming into the port from the service
provider.
Line Rate
These are the data transfer rates at which the port is sending and receiving data.
Actual Net Data
Rate
These are the rates at which the port is sending and receiving the payload data without
transport layer protocol headers and traffic.
Trellis Coding
This displays whether or not the port is using Trellis coding for traffic it is sending and
receiving. Trellis coding helps to reduce the noise in ADSL transmissions. Trellis may reduce
throughput but it makes the connection more stable.
SNR Margin
This is the upstream and downstream Signal-to-Noise Ratio margin (in dB). A DMT subcarrier’s SNR is the ratio between the received signal power and the received noise power.
The signal-to-noise ratio margin is the maximum that the received noise power could
increase with the system still being able to meet its transmission targets.
Actual Delay
This is the upstream and downstream interleave delay. It is the wait (in milliseconds) that
determines the size of a single block of data to be interleaved (assembled) and then
transmitted. Interleave delay is used when transmission error correction (Reed- Solomon)
is necessary due to a less than ideal telephone line. The bigger the delay, the bigger the
data block size, allowing better error correction to be performed.
Transmit Power
This is the upstream and downstream far end actual aggregate transmit power (in dBm).
Upstream is how much power the port is using to transmit to the service provider.
Downstream is how much port the service provider is using to transmit to the port.
Receive Power
Upstream is how much power the service provider is receiving from the port. Downstream
is how much power the port is receiving from the service provider.
Actual INP
Sudden spikes in the line’s level of external noise (impulse noise) can cause errors and
result in lost packets. This could especially impact the quality of multimedia traffic such as
voice or video. Impulse noise protection (INP) provides a buffer to allow for correction of
errors caused by error correction to deal with this. The number of DMT (Discrete MultiTone) symbols shows the level of impulse noise protection for the upstream and
downstream traffic. A higher symbol value provides higher error correction capability, but it
causes overhead and higher delay which may increase error rates in received multimedia
data.
Total Attenuation
This is the upstream and downstream line attenuation, measured in decibels (dB). This
attenuation is the difference between the power transmitted at the near-end and the power
received at the far-end. Attenuation is affected by the channel characteristics (wire gauge,
quality, condition and length of the physical line).
Attainable Net
Data Rate
These are the highest theoretically possible transfer rates at which the port could send and
receive payload data without transport layer protocol headers and traffic.
xDSL Counters
VMG4381-B10A User’s Guide
256
Chapter 25 xDSL Statistics
Table 102 Status > xDSL Statistics (continued)
LABEL
DESCRIPTION
Downstream
These are the statistics for the traffic direction coming into the port from the service
provider.
Upstream
These are the statistics for the traffic direction going out from the port to the service
provider.
FEC
This is the number of Far End Corrected blocks.
CRC
This is the number of Cyclic Redundancy Checks.
ES
This is the number of Errored Seconds meaning the number of seconds containing at least
one errored block or at least one defect.
SES
This is the number of Severely Errored Seconds meaning the number of seconds containing
30% or more errored blocks or at least one defect. This is a subset of ES.
UAS
This is the number of UnAvailable Seconds.
LOS
This is the number of Loss Of Signal seconds.
LOF
This is the number of Loss Of Frame seconds.
LOM
This is the number of Loss of Margin seconds.
VMG4381-B10A User’s Guide
257
Chapter 25 xDSL Statistics
VMG4381-B10A User’s Guide
258
C HAPTER
26
User Account
26.1 Overview
In the Users Account screen, you can change the password of the user account that you used to
log in the Device.
26.2 The User Account Screen
Click Maintenance > User Account to open the following screen.
Figure 131 Maintenance > User Account
The following table describes the labels in this screen.
Table 103 Maintenance > User Account
LABEL
DESCRIPTION
User Name
This field displays the name of the account that you used to log in the system.
Old Password
Type the default password or the existing password you use to access the system in this
field.
New Password
Type your new system password (up to 30 characters). Note that as you type a password,
the screen displays a (*) for each character you type. After you change the password, use
the new password to access the Device.
Retype to
confirm
Type the new password again for confirmation.
Apply
Click Apply to save your changes.
Cancel
Click Cancel to restore your previously saved settings.
VMG4381-B10A User’s Guide
259
Chapter 26 User Account
VMG4381-B10A User’s Guide
260
C HAPTER
27
Remote Management
27.1 Overview
Remote Management allows you to manage your Device from a remote location through the
following interfaces:
• LAN
• WAN
• Trust Domain
Note: The Device is managed using the Web Configurator.
27.2 The Remote MGMT Screen
Use this screen to configure through which interface(s) users can use which service(s) to manage
the Device.
Click Maintenance > Remote MGMT to open the following screen.
Figure 132 Maintenance > Remote MGMT
VMG4381-B10A User’s Guide
261
Chapter 27 Remote Management
The following table describes the fields in this screen.
Table 104 Maintenance > Remote MGMT
LABEL
DESCRIPTION
Trust Domain
Status
This field displays whether the Trust Domain is active or not.
IP Address
Enter the Trust Domain IP address.
Services
This is the service you may use to access the Device.
LAN/WLAN
Select the Enable check box for the corresponding services that you want to allow access to
the Device from the LAN/WLAN.
WAN
Select the Enable check box for the corresponding services that you want to allow access to
the Device from the WAN.
Trust Domain
Select the Enable check box for the corresponding services that you want to allow access to
the Device from the Trust Domain.
Port
You may change the server port number for a service if needed, however you must use the
same port number in order to use that service for remote management.
Certificate
HTTPS
Certificate
Select a certificate the HTTPS server (the Device) uses to authenticate itself to the HTTPS
client. You must have certificates already configured in the Certificates screen.
Apply
Click Apply to save your changes back to the Device.
Cancel
Click Cancel to restore your previously saved settings.
VMG4381-B10A User’s Guide
262
C HAPTER
28
TR-069 Client
28.1 Overview
This chapter explains how to configure the Device’s TR-069 auto-configuration settings.
28.2 The TR-069 Client Screen
TR-069 defines how Customer Premise Equipment (CPE), for example your Device, can be managed
over the WAN by an Auto Configuration Server (ACS). TR-069 is based on sending Remote
Procedure Calls (RPCs) between an ACS and a client device. RPCs are sent in Extensible Markup
Language (XML) format over HTTP or HTTPS.
An administrator can use an ACS to remotely set up the Device, modify settings, perform firmware
upgrades as well as monitor and diagnose the Device. You have to enable the device to be managed
by the ACS and specify the ACS IP address or domain name and username and password.
Click Maintenance > TR-069 Client to open the following screen. Use this screen to configure
your Device to be managed by an ACS.
Figure 133 Maintenance > TR-069 Client
VMG4381-B10A User’s Guide
263
Chapter 28 TR-069 Client
The following table describes the fields in this screen.
Table 105 Maintenance > TR-069 Client
LABEL
DESCRIPTION
Inform
Select Enable for the Device to send periodic inform via TR-069 on the WAN. Otherwise,
select Disable.
Inform Interval
Enter the time interval (in seconds) at which the Device sends information to the autoconfiguration server.
ACS URL
Enter the URL or IP address of the auto-configuration server.
ACS User Name
Enter the TR-069 user name for authentication with the auto-configuration server.
ACS Password
Enter the TR-069 password for authentication with the auto-configuration server.
WAN Interface
used by TR-069
client
Select a WAN interface through which the TR-069 traffic passes.
If you select Any_WAN, you should also select the pre-configured WAN connection(s).
Display SOAP
messages on
serial console
Select Enable to show the SOAP messages on the console.
Connection
Request
Authentication
Select this option to enable authentication when there is a connection request from the ACS.
Connection
Request User
Name
Enter the connection request user name.
Connection
Request
Password
Enter the connection request password.
When the ACS makes a connection request to the Device, this user name is used to
authenticate the ACS.
When the ACS makes a connection request to the Device, this password is used to
authenticate the ACS.
Connection
Request URL
This shows the connection request URL.
Local certificate
used by TR-069
client
You can choose a local certificate used by TR-069 client. The local certificate should be
imported in the Security > Certificates > Local Certificates screen.
Apply
Click Apply to save your changes.
Cancel
Click Cancel to exit this screen without saving.
The ACS can use this URL to make a connection request to the Device.
VMG4381-B10A User’s Guide
264
C HAPTER
29
TR-064
29.1 Overview
This chapter explains how to configure the Device’s TR-064 auto-configuration settings.
29.2 The TR-064 Screen
TR-064 is a LAN-Side DSL CPE Configuration protocol defined by the DSL Forum. TR-064 is built on
top of UPnP. It allows the users to use a TR-064 compliant CPE management application on their
computers from the LAN to discover the CPE and configure user-specific parameters, such as the
username and password.
Click Maintenance > TR-064 to open the following screen.
Figure 134 Maintenance > TR-064
The following table describes the fields in this screen.
Table 106 Maintenance > TR-064
LABEL
DESCRIPTION
State
Select Enable to activate management via TR-064 on the LAN.
Apply
Click Apply to save your changes.
Cancel
Click Cancel to exit this screen without saving.
VMG4381-B10A User’s Guide
265
Chapter 29 TR-064
VMG4381-B10A User’s Guide
266
C HAPTER
30
Time Settings
30.1 Overview
This chapter shows you how to configure system related settings, such as system time, password,
name, the domain name and the inactivity timeout interval.
30.2 The Time Screen
To change your Device’s time and date, click Maintenance > Time. The screen appears as shown.
Use this screen to configure the Device’s time based on your local time zone.
Figure 135 Maintenance > Time Setting
VMG4381-B10A User’s Guide
267
Chapter 30 Time Settings
The following table describes the fields in this screen.
Table 107 Maintenance > Time Setting
LABEL
DESCRIPTION
Current Date/Time
Current Time
This field displays the time of your Device.
Each time you reload this page, the Device synchronizes the time with the time server.
Current Date
This field displays the date of your Device.
Each time you reload this page, the Device synchronizes the date with the time server.
NTP Time Server
First ~ Fifth NTP
time server
Select an NTP time server from the drop-down list box.
Otherwise, select Other and enter the IP address or URL (up to 29 extended ASCII
characters in length) of your time server.
Select None if you don’t want to configure the time server.
Check with your ISP/network administrator if you are unsure of this information.
Time Zone
Time zone offset
Choose the time zone of your location. This will set the time difference between your time
zone and Greenwich Mean Time (GMT).
Daylight Saving
Daylight Saving Time is a period from late spring to early fall when many countries set
their clocks ahead of normal local time by one hour to give more daytime light in the
evening.
State
Select Enable if you use Daylight Saving Time.
Start rule:
Configure the day and time when Daylight Saving Time starts if you enabled Daylight
Saving. You can select a specific date in a particular month or a specific day of a specific
week in a particular month. The Time field uses the 24 hour format. Here are a couple of
examples:
Daylight Saving Time starts in most parts of the United States on the second Sunday of
March. Each time zone in the United States starts using Daylight Saving Time at 2 A.M.
local time. So in the United States, set the day to Second, Sunday, the month to March
and the time to 2 in the Hour field.
Daylight Saving Time starts in the European Union on the last Sunday of March. All of the
time zones in the European Union start using Daylight Saving Time at the same moment
(1 A.M. GMT or UTC). So in the European Union you would set the day to Last, Sunday
and the month to March. The time you select in the o'clock field depends on your time
zone. In Germany for instance, you would select 2 in the Hour field because Germany's
time zone is one hour ahead of GMT or UTC (GMT+1).
End rule
Configure the day and time when Daylight Saving Time ends if you enabled Daylight
Saving. You can select a specific date in a particular month or a specific day of a specific
week in a particular month. The Time field uses the 24 hour format. Here are a couple of
examples:
Daylight Saving Time ends in the United States on the first Sunday of November. Each
time zone in the United States stops using Daylight Saving Time at 2 A.M. local time. So
in the United States you would set the day to First, Sunday, the month to November
and the time to 2 in the Hour field.
Daylight Saving Time ends in the European Union on the last Sunday of October. All of the
time zones in the European Union stop using Daylight Saving Time at the same moment
(1 A.M. GMT or UTC). So in the European Union you would set the day to Last, Sunday,
and the month to October. The time you select in the o'clock field depends on your time
zone. In Germany for instance, you would select 2 in the Hour field because Germany's
time zone is one hour ahead of GMT or UTC (GMT+1).
VMG4381-B10A User’s Guide
268
Chapter 30 Time Settings
Table 107 Maintenance > Time Setting (continued)
LABEL
DESCRIPTION
Apply
Click Apply to save your changes.
Cancel
Click Cancel to exit this screen without saving.
VMG4381-B10A User’s Guide
269
Chapter 30 Time Settings
VMG4381-B10A User’s Guide
270
C HAPTER
31
E-mail Notification
31.1 Overview
A mail server is an application or a computer that runs such an application to receive, forward and
deliver e-mail messages.
To have the Device send reports, logs or notifications via e-mail, you must specify an e-mail server
and the e-mail addresses of the sender and receiver.
31.2 The Email Notification Screen
Click Maintenance > Email Notification to open the Email Notification screen. Use this screen
to view, remove and add mail server information on the Device.
Figure 136 Maintenance > Email Notification
The following table describes the labels in this screen.
Table 108 Maintenance > Email Notification
LABEL
DESCRIPTION
Add New Email
Click this button to create a new entry.
Mail Server
Address
This field displays the server name or the IP address of the mail server.
Username
This field displays the user name of the sender’s mail account.
Password
This field displays the password of the sender’s mail account.
Email Address
This field displays the e-mail address that you want to be in the from/sender line of the email that the Device sends.
Remove
Click this button to delete the selected entry(ies).
31.2.1 Email Notification Edit
Click the Add button in the Email Notification screen. Use this screen to configure the required
information for sending e-mail via a mail server.
VMG4381-B10A User’s Guide
271
Chapter 31 E-mail Notification
Figure 137 Email Notification > Add
The following table describes the labels in this screen.
Table 109 Email Notification > Add
LABEL
DESCRIPTION
Mail Server
Address
Enter the server name or the IP address of the mail server for the e-mail address specified
in the Account Email Address field.
Authentication
Username
Enter the user name (up to 32 characters). This is usually the user name of a mail account
you specified in the Account Email Address field.
Authentication
Password
Enter the password associated with the user name above.
Account Email
Address
Enter the e-mail address that you want to be in the from/sender line of the e-mail
notification that the Device sends.
If this field is left blank, reports, logs or notifications will not be sent via e-mail.
If you activate SSL/TLS authentication, the e-mail address must be able to be authenticated
by the mail server as well.
Apply
Click this button to save your changes and return to the previous screen.
Cancel
Click this button to begin configuring this screen afresh.
VMG4381-B10A User’s Guide
272
C HAPTER
32
Logs Setting
32.1 Overview
You can configure where the Device sends logs and which logs and/or immediate alerts the Device
records in the Logs Setting screen.
32.2 The Log Settings Screen
To change your Device’s log settings, click Maintenance > Logs Setting. The screen appears as
shown.
Figure 138 Maintenance > Logs Setting
VMG4381-B10A User’s Guide
273
Chapter 32 Logs Setting
The following table describes the fields in this screen.
Table 110 Maintenance > Logs Setting
LABEL
DESCRIPTION
Syslog Setting
Syslog Logging
The Device sends a log to an external syslog server. Select Enable to enable syslog logging.
Mode
Select the syslog destination from the drop-down list box.
If you select Remote, the log(s) will be sent to a remote syslog server. If you select Local
File, the log(s) will be saved in a local file. If you want to send the log(s) to a remote syslog
server and save it in a local file, select Local File and Remote.
Syslog Server
Enter the server name or IP address of the syslog server that will log the selected categories
of logs.
UDP Port
Enter the port number used by the syslog server.
E-mail Log Settings
Mail Server
Enter the server name or the IP address of the mail server for the e-mail addresses
specified below. If this field is left blank, logs and alert messages will not be sent via E-mail.
System Log
Mail Subject
Type a title that you want to be in the subject line of the system log e-mail message that
the Device sends.
Security Log
Mail Subject
Type a title that you want to be in the subject line of the security log e-mail message that
the Device sends.
Send Log to
The Device sends logs to the e-mail address specified in this field. If this field is left blank,
the Device does not send logs via E-mail.
Send Alarm to
Alerts are real-time notifications that are sent as soon as an event, such as a DoS attack,
system error, or forbidden web access attempt occurs. Enter the E-mail address where the
alert messages will be sent. Alerts include system errors, attacks and attempted access to
blocked web sites. If this field is left blank, alert messages will not be sent via E-mail.
Alarm Interval
Specify how often the alarm should be updated.
Allowed
Capacity Before
Email
Set what percent of the Device’s log storage space can be filled before the Device sends a
log e-mail.
Clear log after
sending mail
Select this to delete all the logs after the Device sends an E-mail of the logs.
Active Log and Alert
System Log
Select the categories of system logs that you want to record.
Security Log
Select the categories of security logs that you want to record.
Send
immediate alert
Select log categories for which you want the Device to send E-mail alerts immediately.
Apply
Click Apply to save your changes.
Cancel
Click Cancel to restore your previously saved settings.
32.2.1 Example E-mail Log
An "End of Log" message displays for each mail in which a complete log has been sent. The
following is an example of a log sent by e-mail.
• You may edit the subject title.
• The date format here is Day-Month-Year.
• The date format here is Month-Day-Year. The time format is Hour-Minute-Second.
VMG4381-B10A User’s Guide
274
Chapter 32 Logs Setting
• "End of Log" message shows that a complete log has been sent.
Figure 139 E-mail Log Example
Subject:
Firewall Alert From
Date:
Fri, 07 Apr 2000 10:05:42
From:
user@zyxel.com
To:
user@zyxel.com
1|Apr 7 00 |From:192.168.1.1
To:192.168.1.255
|default policy |forward
| 09:54:03 |UDP
src port:00520 dest port:00520 |<1,00>
2|Apr 7 00 |From:192.168.1.131
To:192.168.1.255
|default policy |forward
| 09:54:17 |UDP
src port:00520 dest port:00520 |<1,00>
3|Apr 7 00 |From:192.168.1.6
To:10.10.10.10 |match
|forward
| 09:54:19 |UDP
src port:03516 dest port:00053 |<1,01>
……………………………..{snip}…………………………………..
……………………………..{snip}…………………………………..
126|Apr 7 00 |From:192.168.1.1
To:192.168.1.255
|match
|forward
| 10:05:00 |UDP
src port:00520 dest port:00520 |<1,02>
127|Apr 7 00 |From:192.168.1.131
To:192.168.1.255
|match
|forward
| 10:05:17 |UDP
src port:00520 dest port:00520 |<1,02>
128|Apr 7 00 |From:192.168.1.1
To:192.168.1.255
|match
|forward
| 10:05:30 |UDP
src port:00520 dest port:00520 |<1,02>
End of Firewall Log
VMG4381-B10A User’s Guide
275
Chapter 32 Logs Setting
VMG4381-B10A User’s Guide
276
C HAPTER
33
Firmware Upgrade
33.1 Overview
This chapter explains how to upload new firmware to your Device. You can download new firmware
releases from your nearest ZyXEL FTP site (or www.zyxel.com) to use to upgrade your device’s
performance.
Only use firmware for your device’s specific model. Refer to the label on
the bottom of your Device.
33.2 The Firmware Screen
Click Maintenance > Firmware Upgrade to open the following screen. The upload process uses
HTTP (Hypertext Transfer Protocol) and may take up to two minutes. After a successful upload, the
system will reboot.
Do NOT turn off the Device while firmware upload is in progress!
Figure 140 Maintenance > Firmware Upgrade
The following table describes the labels in this screen.
Table 111 Maintenance > Firmware Upgrade
LABEL
DESCRIPTION
Current
Firmware
Version
This is the present Firmware version and the date created.
File Path
Type in the location of the file you want to upload in this field or click Browse ... to find it.
Browse...
Click this to find the .bin file you want to upload. Remember that you must decompress
compressed (.zip) files before you can upload them.
Upload
Click this to begin the upload process. This process may take up to two minutes.
After you see the firmware updating screen, wait two minutes before logging into the Device again.
VMG4381-B10A User’s Guide
277
Chapter 33 Firmware Upgrade
Figure 141 Firmware Uploading
The Device automatically restarts in this time causing a temporary network disconnect. In some
operating systems, you may see the following icon on your desktop.
Figure 142 Network Temporarily Disconnected
After two minutes, log in again and check your new firmware version in the Status screen.
If the upload was not successful, the following screen will appear. Click OK to go back to the
Firmware Upgrade screen.
Figure 143 Error Message
VMG4381-B10A User’s Guide
278
C HAPTER
34
Configuration
34.1 Overview
The Configuration screen allows you to backup and restore device configurations. You can also
reset your device settings back to the factory default.
34.2 The Configuration Screen
Click Maintenance > Configuration. Information related to factory defaults, backup
configuration, and restoring configuration appears in this screen, as shown next.
Figure 144 Maintenance > Configuration
Backup Configuration
Backup Configuration allows you to back up (save) the Device’s current configuration to a file on
your computer. Once your Device is configured and functioning properly, it is highly recommended
that you back up your configuration file before making configuration changes. The backup
configuration file will be useful in case you need to return to your previous settings.
Click Backup to save the Device’s current configuration to your computer.
VMG4381-B10A User’s Guide
279
Chapter 34 Configuration
Restore Configuration
Restore Configuration allows you to upload a new or previously saved configuration file from your
computer to your Device.
Table 112 Restore Configuration
LABEL
DESCRIPTION
File Path
Type in the location of the file you want to upload in this field or click Browse ... to find it.
Browse...
Click this to find the file you want to upload. Remember that you must decompress
compressed (.ZIP) files before you can upload them.
Upload
Click this to begin the upload process.
Do not turn off the Device while configuration file upload is in progress.
After the Device configuration has been restored successfully, the login screen appears. Login again
to restart the Device.
The Device automatically restarts in this time causing a temporary network disconnect. In some
operating systems, you may see the following icon on your desktop.
Figure 145 Network Temporarily Disconnected
If you uploaded the default configuration file you may need to change the IP address of your
computer to be in the same subnet as that of the default device IP address (192.168.1.1). See
Appendix A on page 295 for details on how to set up your computer’s IP address.
If the upload was not successful, the following screen will appear. Click OK to go back to the
Configuration screen.
Figure 146 Configuration Upload Error
Reset to Factory Defaults
Click the Reset button to clear all user-entered configuration information and return the Device to
its factory defaults. The following warning screen appears.
VMG4381-B10A User’s Guide
280
Chapter 34 Configuration
Figure 147 Reset Warning Message
Figure 148 Reset In Process Message
You can also press the RESET button on the rear panel to reset the factory defaults of your Device.
Refer to Section 1.6 on page 22 for more information on the RESET button.
34.3 The Reboot Screen
System restart allows you to reboot the Device remotely without turning the power off. You may
need to do this if the Device hangs, for example.
Click Maintenance > Reboot. Click Reboot to have the Device reboot. This does not affect the
Device's configuration.
Figure 149 Maintenance > Reboot
VMG4381-B10A User’s Guide
281
C HAPTER
35
Diagnostic
35.1 Overview
The Diagnostic screens display information to help you identify problems with the Device.
The route between a CO VDSL switch and one of its CPE may go through switches owned by
independent organizations. A connectivity fault point generally takes time to discover and impacts
subscriber’s network access. In order to eliminate the management and maintenance efforts, IEEE
802.1ag is a Connectivity Fault Management (CFM) specification which allows network
administrators to identify and manage connection faults. Through discovery and verification of the
path, CFM can detect, analyze and isolate connectivity faults in bridged LANs.
35.1.1 What You Can Do in this Chapter
• The Ping & TraceRoute & NsLookup screen lets you ping an IP address or trace the route
packets take to a host (Section 35.3 on page 283).
• The 802.1ag screen lets you perform CFM actions (Section 35.5 on page 285).
• The OAM Ping Test screen lets you send an ATM OAM (Operation, Administration and
Maintenance) packet to verify the connectivity of a specific PVC. (Section 35.5 on page 285).
35.2 What You Need to Know
The following terms and concepts may help as you read through this chapter.
How CFM Works
A Maintenance Association (MA) defines a VLAN and associated Maintenance End Point (MEP) ports
on the device under a Maintenance Domain (MD) level. An MEP port has the ability to send
Connectivity Check Messages (CCMs) and get other MEP ports information from neighbor devices’
CCMs within an MA.
CFM provides two tests to discover connectivity faults.
• Loopback test - checks if the MEP port receives its Loop Back Response (LBR) from its target
after it sends the Loop Back Message (LBM). If no response is received, there might be a
connectivity fault between them.
• Link trace test - provides additional connectivity fault analysis to get more information on where
the fault is. If an MEP port does not respond to the source MEP, this may indicate a fault.
Administrators can take further action to check and resume services from the fault according to
the line connectivity status report.
VMG4381-B10A User’s Guide
282
Chapter 35 Diagnostic
35.3 Ping & TraceRoute & NsLookup
Use this screen to ping, traceroute, or nslookup an IP address. Click Maintenance > Diagnostic >
Ping & TraceRoute & NsLookup to open the screen shown next.
Figure 150 Maintenance > Diagnostic > Ping & TraceRoute & NsLookup
The following table describes the fields in this screen.
Table 113 Maintenance > Diagnostic > Ping & TraceRoute & NsLookup
LABEL
DESCRIPTION
URL or IP
Address
Type the IP address of a computer that you want to perform ping, traceroute, or nslookup in
order to test a connection.
Ping
Click this to ping the IP address that you entered.
TraceRoute
Click this button to perform the traceroute function. This determines the path a packet
takes to the specified computer.
Nslookup
Click this button to perform a DNS lookup on the IP address of a computer you enter.
35.4 802.1ag
Click Maintenance > Diagnostic > 8.2.1ag to open the following screen. Use this screen to
perform CFM actions.
VMG4381-B10A User’s Guide
283
Chapter 35 Diagnostic
Figure 151 Maintenance > Diagnostic > 802.1ag
The following table describes the fields in this screen.
Table 114 Maintenance > Diagnostic > 802.1ag
LABEL
DESCRIPTION
802.1ag Connectivity Fault Management
Maintenance
Domain (MD)
Level
Select a level (0-7) under which you want to create an MA.
Destination
MAC Address
Enter the target device’s MAC address to which the Device performs a CFM loopback test.
802.1Q VLAN
ID
Type a VLAN ID (0-4095) for this MA.
VDSL Traffic
Type
This shows whether the VDSL traffic is activated.
Loopback
Message (LBM)
This shows how many Loop Back Messages (LBMs) are sent and if there is any inorder or
outorder Loop Back Response (LBR) received from a remote MEP.
Linktrace
Message (LTM)
This shows the destination MAC address in the Link Trace Response (LTR).
Set MD Level
Click this button to configure the MD (Maintenance Domain) level.
Send Loopback
Click this button to have the selected MEP send the LBM (Loop Back Message) to a specified
remote end point.
Send Linktrace
Click this button to have the selected MEP send the LTMs (Link Trace Messages) to a
specified remote end point.
VMG4381-B10A User’s Guide
284
Chapter 35 Diagnostic
35.5 OAM Ping Test
Click Maintenance > Diagnostic > OAM Ping Test to open the screen shown next. Use this
screen to perform an OAM (Operation, Administration and Maintenance) F4 or F5 loopback test on a
PVC. The Device sends an OAM F4 or F5 packet to the DSLAM or ATM switch and then returns it to
the Device. The test result then displays in the text box.
ATM sets up virtual circuits over which end systems communicate. The terminology for virtual
circuits is as follows:
•
Virtual Channel (VC)
Logical connections between ATM devices
•
Virtual Path (VP)
A bundle of virtual channels
•
Virtual Circuits
A series of virtual paths between circuit end points
Figure 152 Virtual Circuit Topology
Think of a virtual path as a cable that contains a bundle of wires. The cable connects two points and
wires within the cable provide individual circuits between the two points. In an ATM cell header, a
VPI (Virtual Path Identifier) identifies a link formed by a virtual path; a VCI (Virtual Channel
Identifier) identifies a channel within a virtual path. A series of virtual paths make up a virtual
circuit.
F4 cells operate at the virtual path (VP) level, while F5 cells operate at the virtual channel (VC)
level. F4 cells use the same VPI as the user data cells on VP connections, but use different
predefined VCI values. F5 cells use the same VPI and VCI as the user data cells on the VC
connections, and are distinguished from data cells by a predefinded Payload Type Identifier (PTI) in
the cell header. Both F4 flows and F5 flows are bidirectional and have two types.
• segment F4 flows (VCI=3)
• end-to-end F4 flows (VCI=4)
• segment F5 flows (PTI=100)
• end-to-end F5 flows (PTI=101)
OAM F4 or F5 tests are used to check virtual path or virtual channel availability between two DSL
devices. Segment flows are terminated at the connecting point which terminates a VP or VC
segment. End-to-end flows are terminated at the end point of a VP or VC connection, where an ATM
link is terminated. Segment loopback tests allow you to verify integrity of a PVC to the nearest
neighboring ATM device. End-to-end loopback tests allow you to verify integrity of an end-to-end
PVC.
Note: The DSLAM to which the Device is connected must also support ATM F4 and/or F5
to use this test.
VMG4381-B10A User’s Guide
285
Chapter 35 Diagnostic
Note: This screen is available only when you configure an ATM layer-2 interface.
Figure 153 Maintenance > Diagnostic > OAM Ping Test
The following table describes the fields in this screen.
Table 115 Maintenance > Diagnostic > OAM Ping Test
LABEL
DESCRIPTION
Select a PVC on which you want to perform the loopback test.
F4 segment
Press this to perform an OAM F4 segment loopback test.
F4 end-end
Press this to perform an OAM F4 end-to-end loopback test.
F5 segment
Press this to perform an OAM F5 segment loopback test.
F5 end-end
Press this to perform an OAM F5 end-to-end loopback test.
VMG4381-B10A User’s Guide
286
C HAPTER
36
Troubleshooting
This chapter offers some suggestions to solve problems you might encounter. The potential
problems are divided into the following categories.
• Power, Hardware Connections, and LEDs
• Device Access and Login
• Internet Access
• Wireless Internet Access
• USB Device Connection
• UPnP
36.1 Power, Hardware Connections, and LEDs
The Device does not turn on. None of the LEDs turn on.
Make sure the Device is turned on.
Make sure you are using the power adaptor or cord included with the Device.
Make sure the power adaptor or cord is connected to the Device and plugged in to an appropriate
power source. Make sure the power source is turned on.
Turn the Device off and on.
If the problem continues, contact the vendor.
One of the LEDs does not behave as expected.
Make sure you understand the normal behavior of the LED. See Section 1.5 on page 21.
Check the hardware connections.
Inspect your cables for damage. Contact the vendor to replace any damaged cables.
Turn the Device off and on.
VMG4381-B10A User’s Guide
287
Chapter 36 Troubleshooting
If the problem continues, contact the vendor.
36.2 Device Access and Login
I forgot the IP address for the Device.
The default LAN IP address is 192.168.1.1.
If you changed the IP address and have forgotten it, you might get the IP address of the Device by
looking up the IP address of the default gateway for your computer. To do this in most Windows
computers, click Start > Run, enter cmd, and then enter ipconfig. The IP address of the Default
Gateway might be the IP address of the Device (it depends on the network), so enter this IP
address in your Internet browser.
If this does not work, you have to reset the device to its factory defaults. See Section 1.6 on page
22.
I forgot the password.
The default admin password is 1234.
If this does not work, you have to reset the device to its factory defaults. See Section 1.6 on page
22.
I cannot see or access the Login screen in the web configurator.
Make sure you are using the correct IP address.
• The default IP address is 192.168.1.1.
• If you changed the IP address (Section 8.2 on page 135), use the new IP address.
• If you changed the IP address and have forgotten it, see the troubleshooting suggestions for I
forgot the IP address for the Device.
Check the hardware connections, and make sure the LEDs are behaving as expected. See Section
1.5 on page 21.
Make sure your Internet browser does not block pop-up windows and has JavaScripts and Java
enabled. See Appendix C on page 323.
If it is possible to log in from another interface, check the service control settings for HTTP and
HTTPS (Maintenance > Remote MGMT).
VMG4381-B10A User’s Guide
288
Chapter 36 Troubleshooting
Reset the device to its factory defaults, and try to access the Device with the default IP address.
See Section 1.6 on page 22.
If the problem continues, contact the network administrator or vendor, or try one of the advanced
suggestions.
Advanced Suggestions
• Make sure you have logged out of any earlier management sessions using the same user account
even if they were through a different interface or using a different browser.
• Try to access the Device using another service, such as Telnet. If you can access the Device,
check the remote management settings and firewall rules to find out why the Device does not
respond to HTTP.
I can see the Login screen, but I cannot log in to the Device.
Make sure you have entered the password correctly. The default admin password is 1234. The field
is case-sensitive, so make sure [Caps Lock] is not on.
You cannot log in to the web configurator while someone is using Telnet to access the Device. Log
out of the Device in the other session, or ask the person who is logged in to log out.
Turn the Device off and on.
If this does not work, you have to reset the device to its factory defaults. See Section 36.1 on page
287.
I cannot Telnet to the Device.
See the troubleshooting suggestions for I cannot see or access the Login screen in the web
configurator. Ignore the suggestions about your browser.
I cannot use FTP to upload / download the configuration file. / I cannot use FTP to upload
new firmware.
See the troubleshooting suggestions for I cannot see or access the Login screen in the web
configurator. Ignore the suggestions about your browser.
VMG4381-B10A User’s Guide
289
Chapter 36 Troubleshooting
36.3 Internet Access
I cannot access the Internet.
Check the hardware connections, and make sure the LEDs are behaving as expected. See the
Quick Start Guide and Section 1.5 on page 21.
Make sure you entered your ISP account information correctly in the Network Setting >
Broadband screen. These fields are case-sensitive, so make sure [Caps Lock] is not on.
If you are trying to access the Internet wirelessly, make sure that you enabled the wireless LAN in
the Device and your wireless client and that the wireless settings in the wireless client are the same
as the settings in the Device.
Disconnect all the cables from your device and reconnect them.
If the problem continues, contact your ISP.
I cannot access the Internet through a DSL connection.
Make sure you have the DSL WAN port connected to a telephone jack (or the DSL or modem jack
on a splitter if you have one).
Make sure you configured a proper DSL WAN interface (Network Setting > Broadband screen)
with the Internet account information provided by your ISP and that it is enabled.
Check that the LAN interface you are connected to is in the same interface group as the DSL
connection (Network Setting > Interface Group).
If you set up a WAN connection using bridging service, make sure you turn off the DHCP feature in
the LAN screen to have the clients get WAN IP addresses directly from your ISP’s DHCP server.
I cannot connect to the Internet using a second DSL connection.
ADSL and VDSL connections cannot work at the same time. You can only use one type of DSL
connection, either ADSL or VDSL connection at one time.
I cannot access the Internet anymore. I had access to the Internet (with the Device), but my
Internet connection is not available anymore.
Your session with the Device may have expired. Try logging into the Device again.
VMG4381-B10A User’s Guide
290
Chapter 36 Troubleshooting
Check the hardware connections, and make sure the LEDs are behaving as expected. See the
Quick Start Guide and Section 1.5 on page 21.
Turn the Device off and on.
If the problem continues, contact your ISP.
36.4 Wireless Internet Access
What factors may cause intermittent or unstabled wireless connection? How can I solve this
problem?
The following factors may cause interference:
• Obstacles: walls, ceilings, furniture, and so on.
• Building Materials: metal doors, aluminum studs.
• Electrical devices: microwaves, monitors, electric motors, cordless phones, and other wireless
devices.
To optimize the speed and quality of your wireless connection, you can:
• Move your wireless device closer to the AP if the signal strength is low.
• Reduce wireless interference that may be caused by other wireless networks or surrounding
wireless electronics such as cordless phones.
• Place the AP where there are minimum obstacles (such as walls and ceilings) between the AP and
the wireless client.
• Reduce the number of wireless clients connecting to the same AP simultaneously, or add
additional APs if necessary.
• Try closing some programs that use the Internet, especially peer-to-peer applications. If the
wireless client is sending or receiving a lot of information, it may have too many programs open
that use the Internet.
What is a Server Set ID (SSID)?
An SSID is a name that uniquely identifies a wireless network. The AP and all the clients within a
wireless network must use the same SSID.
What wireless security modes does my Device support?
Wireless security is vital to your network. It protects communications between wireless stations,
access points and the wired network.
VMG4381-B10A User’s Guide
291
Chapter 36 Troubleshooting
The available security modes in your Device are as follows:
• WPA2-PSK: (recommended) This uses a pre-shared key with the WPA2 standard.
• WPA-PSK: This has the device use either WPA-PSK or WPA2-PSK depending on which security
mode the wireless client uses.
• WPA2: WPA2 (IEEE 802.11i) is a wireless security standard that defines stronger encryption,
authentication and key management than WPA. It requires the use of a RADIUS server and is
mostly used in business networks.
• WPA: Wi-Fi Protected Access (WPA) is a subset of the IEEE 802.11i standard. It requires the use
of a RADIUS server and is mostly used in business networks.
• WEP: Wired Equivalent Privacy (WEP) encryption scrambles the data transmitted between the
wireless stations and the access points to keep network communications private.
36.5 USB Device Connection
The Device fails to detect my USB device.
Disconnect the USB device.
Reboot the Device.
If you are connecting a USB hard drive that comes with an external power supply, make sure it is
connected to an appropriate power source that is on.
Re-connect your USB device to the Device.
36.6 UPnP
When using UPnP and the Device reboots, my computer cannot detect UPnP and refresh My
Network Places > Local Network.
Disconnect the Ethernet cable from the Device’s LAN port or from your computer.
Re-connect the Ethernet cable.
The Local Area Connection icon for UPnP disappears in the screen.
Restart your computer.
VMG4381-B10A User’s Guide
292
Chapter 36 Troubleshooting
I cannot open special applications such as white board, file transfer and video when I use the
MSN messenger.
Wait more than three minutes.
Restart the applications.
VMG4381-B10A User’s Guide
293
Chapter 36 Troubleshooting
VMG4381-B10A User’s Guide
294
A PPENDIX
Setting up Your Computer’s IP Address
All computers must have a 10M or 100M Ethernet adapter card and TCP/IP installed.
Windows 95/98/Me/NT/2000/XP/Vista, Macintosh OS 7 and later operating systems and all versions
of UNIX/LINUX include the software components you need to install and use TCP/IP on your
computer. Windows 3.1 requires the purchase of a third-party TCP/IP application package.
TCP/IP should already be installed on computers using Windows NT/2000/XP, Macintosh OS 7 and
later operating systems.
After the appropriate TCP/IP components are installed, configure the TCP/IP settings in order to
"communicate" with your network.
If you manually assign IP information instead of using dynamic assignment, make sure that your
computers have IP addresses that place them in the same subnet as the Device’s LAN port.
Windows 95/98/Me
Click Start, Settings, Control Panel and double-click the Network icon to open the Network
window.
Figure 154 WIndows 95/98/Me: Network: Configuration
VMG4381-B10A User’s Guide
295
Appendix A Setting up Your Computer’s IP Address
Installing Components
The Network window Configuration tab displays a list of installed components. You need a
network adapter, the TCP/IP protocol and Client for Microsoft Networks.
If you need the adapter:
In the Network window, click Add.
Select Adapter and then click Add.
Select the manufacturer and model of your network adapter and then click OK.
If you need TCP/IP:
In the Network window, click Add.
Select Protocol and then click Add.
Select Microsoft from the list of manufacturers.
Select TCP/IP from the list of network protocols and then click OK.
If you need Client for Microsoft Networks:
Click Add.
Select Client and then click Add.
Select Microsoft from the list of manufacturers.
Select Client for Microsoft Networks from the list of network clients and then click OK.
Restart your computer so the changes you made take effect.
Configuring
In the Network window Configuration tab, select your network adapter's TCP/IP entry and click
Properties
Click the IP Address tab.
• If your IP address is dynamic, select Obtain an IP address automatically.
• If you have a static IP address, select Specify an IP address and type your information into
the IP Address and Subnet Mask fields.
VMG4381-B10A User’s Guide
296
Appendix A Setting up Your Computer’s IP Address
Figure 155 Windows 95/98/Me: TCP/IP Properties: IP Address
Click the DNS Configuration tab.
• If you do not know your DNS information, select Disable DNS.
• If you know your DNS information, select Enable DNS and type the information in the fields
below (you may not need to fill them all in).
Figure 156 Windows 95/98/Me: TCP/IP Properties: DNS Configuration
Click the Gateway tab.
VMG4381-B10A User’s Guide
297
Appendix A Setting up Your Computer’s IP Address
• If you do not know your gateway’s IP address, remove previously installed gateways.
• If you have a gateway IP address, type it in the New gateway field and click Add.
Click OK to save and close the TCP/IP Properties window.
Click OK to close the Network window. Insert the Windows CD if prompted.
Turn on your Device and restart your computer when prompted.
Verifying Settings
Click Start and then Run.
In the Run window, type "winipcfg" and then click OK to open the IP Configuration window.
Select your network adapter. You should see your computer's IP address, subnet mask and default
gateway.
Windows 2000/NT/XP
The following example figures use the default Windows XP GUI theme.
Click start (Start in Windows 2000/NT), Settings, Control Panel.
Figure 157 Windows XP: Start Menu
In the Control Panel, double-click Network Connections (Network and Dial-up Connections
in Windows 2000/NT).
VMG4381-B10A User’s Guide
298
Appendix A Setting up Your Computer’s IP Address
Figure 158 Windows XP: Control Panel
Right-click Local Area Connection and then click Properties.
Figure 159 Windows XP: Control Panel: Network Connections: Properties
Select Internet Protocol (TCP/IP) (under the General tab in Win XP) and then click Properties.
VMG4381-B10A User’s Guide
299
Appendix A Setting up Your Computer’s IP Address
Figure 160 Windows XP: Local Area Connection Properties
The Internet Protocol TCP/IP Properties window opens (the General tab in Windows XP).
• If you have a dynamic IP address click Obtain an IP address automatically.
• If you have a static IP address click Use the following IP Address and fill in the IP address,
Subnet mask, and Default gateway fields.
• Click Advanced.
Figure 161 Windows XP: Internet Protocol (TCP/IP) Properties
VMG4381-B10A User’s Guide
300
Appendix A Setting up Your Computer’s IP Address
If you do not know your gateway's IP address, remove any previously installed gateways in the IP
Settings tab and click OK.
Do one or more of the following if you want to configure additional IP addresses:
• In the IP Settings tab, in IP addresses, click Add.
• In TCP/IP Address, type an IP address in IP address and a subnet mask in Subnet mask,
and then click Add.
• Repeat the above two steps for each IP address you want to add.
• Configure additional default gateways in the IP Settings tab by clicking Add in Default
gateways.
• In TCP/IP Gateway Address, type the IP address of the default gateway in Gateway. To
manually configure a default metric (the number of transmission hops), clear the Automatic
metric check box and type a metric in Metric.
• Click Add.
• Repeat the previous three steps for each default gateway you want to add.
• Click OK when finished.
Figure 162 Windows XP: Advanced TCP/IP Properties
In the Internet Protocol TCP/IP Properties window (the General tab in Windows XP):
• Click Obtain DNS server address automatically if you do not know your DNS server IP
address(es).
• If you know your DNS server IP address(es), click Use the following DNS server
addresses, and type them in the Preferred DNS server and Alternate DNS server fields.
If you have previously configured DNS servers, click Advanced and then the DNS tab to order
them.
VMG4381-B10A User’s Guide
301
Appendix A Setting up Your Computer’s IP Address
Figure 163 Windows XP: Internet Protocol (TCP/IP) Properties
Click OK to close the Internet Protocol (TCP/IP) Properties window.
Click Close (OK in Windows 2000/NT) to close the Local Area Connection Properties window.
10
Close the Network Connections window (Network and Dial-up Connections in Windows
2000/NT).
11 Turn on your Device and restart your computer (if prompted).
Verifying Settings
Click Start, All Programs, Accessories and then Command Prompt.
In the Command Prompt window, type "ipconfig" and then press [ENTER]. You can also open
Network Connections, right-click a network connection, click Status and then click the Support
tab.
Windows Vista
This section shows screens from Windows Vista Enterprise Version 6.0.
Click the Start icon, Control Panel.
VMG4381-B10A User’s Guide
302
Appendix A Setting up Your Computer’s IP Address
Figure 164 Windows Vista: Start Menu
In the Control Panel, double-click Network and Internet.
Figure 165 Windows Vista: Control Panel
Click Network and Sharing Center.
Figure 166 Windows Vista: Network And Internet
Click Manage network connections.
Figure 167 Windows Vista: Network and Sharing Center
VMG4381-B10A User’s Guide
303
Appendix A Setting up Your Computer’s IP Address
Right-click Local Area Connection and then click Properties.
Note: During this procedure, click Continue whenever Windows displays a screen saying
that it needs your permission to continue.
Figure 168 Windows Vista: Network and Sharing Center
Select Internet Protocol Version 4 (TCP/IPv4) and click Properties.
Figure 169 Windows Vista: Local Area Connection Properties
The Internet Protocol Version 4 (TCP/IPv4) Properties window opens (the General tab).
• If you have a dynamic IP address click Obtain an IP address automatically.
VMG4381-B10A User’s Guide
304
Appendix A Setting up Your Computer’s IP Address
• If you have a static IP address click Use the following IP address and fill in the IP address,
Subnet mask, and Default gateway fields.
• Click Advanced.
Figure 170 Windows Vista: Internet Protocol Version 4 (TCP/IPv4) Properties
If you do not know your gateway's IP address, remove any previously installed gateways in the IP
Settings tab and click OK.
Do one or more of the following if you want to configure additional IP addresses:
• In the IP Settings tab, in IP addresses, click Add.
• In TCP/IP Address, type an IP address in IP address and a subnet mask in Subnet mask,
and then click Add.
• Repeat the above two steps for each IP address you want to add.
• Configure additional default gateways in the IP Settings tab by clicking Add in Default
gateways.
• In TCP/IP Gateway Address, type the IP address of the default gateway in Gateway. To
manually configure a default metric (the number of transmission hops), clear the Automatic
metric check box and type a metric in Metric.
• Click Add.
• Repeat the previous three steps for each default gateway you want to add.
• Click OK when finished.
VMG4381-B10A User’s Guide
305
Appendix A Setting up Your Computer’s IP Address
Figure 171 Windows Vista: Advanced TCP/IP Properties
In the Internet Protocol Version 4 (TCP/IPv4) Properties window, (the General tab):
• Click Obtain DNS server address automatically if you do not know your DNS server IP
address(es).
• If you know your DNS server IP address(es), click Use the following DNS server
addresses, and type them in the Preferred DNS server and Alternate DNS server fields.
If you have previously configured DNS servers, click Advanced and then the DNS tab to order
them.
VMG4381-B10A User’s Guide
306
Appendix A Setting up Your Computer’s IP Address
Figure 172 Windows Vista: Internet Protocol Version 4 (TCP/IPv4) Properties
10 Click OK to close the Internet Protocol Version 4 (TCP/IPv4) Properties window.
11 Click Close to close the Local Area Connection Properties window.
12
Close the Network Connections window.
13 Turn on your Device and restart your computer (if prompted).
Verifying Settings
Click Start, All Programs, Accessories and then Command Prompt.
In the Command Prompt window, type "ipconfig" and then press [ENTER]. You can also open
Network Connections, right-click a network connection, click Status and then click the Support
tab.
Macintosh OS 8/9
Click the Apple menu, Control Panel and double-click TCP/IP to open the TCP/IP Control
Panel.
VMG4381-B10A User’s Guide
307
Appendix A Setting up Your Computer’s IP Address
Figure 173 Macintosh OS 8/9: Apple Menu
Select Ethernet built-in from the Connect via list.
Figure 174 Macintosh OS 8/9: TCP/IP
For dynamically assigned settings, select Using DHCP Server from the Configure: list.
For statically assigned settings, do the following:
VMG4381-B10A User’s Guide
308
Appendix A Setting up Your Computer’s IP Address
• From the Configure box, select Manually.
• Type your IP address in the IP Address box.
• Type your subnet mask in the Subnet mask box.
• Type the IP address of your Device in the Router address box.
Close the TCP/IP Control Panel.
Click Save if prompted, to save changes to your configuration.
Turn on your Device and restart your computer (if prompted).
Verifying Settings
Check your TCP/IP properties in the TCP/IP Control Panel window.
Macintosh OS X
Click the Apple menu, and click System Preferences to open the System Preferences window.
Figure 175 Macintosh OS X: Apple Menu
Click Network in the icon bar.
• Select Automatic from the Location list.
• Select Built-in Ethernet from the Show list.
• Click the TCP/IP tab.
For dynamically assigned settings, select Using DHCP from the Configure list.
VMG4381-B10A User’s Guide
309
Appendix A Setting up Your Computer’s IP Address
Figure 176 Macintosh OS X: Network
For statically assigned settings, do the following:
• From the Configure box, select Manually.
• Type your IP address in the IP Address box.
• Type your subnet mask in the Subnet mask box.
• Type the IP address of your Device in the Router address box.
Click Apply Now and close the window.
Turn on your Device and restart your computer (if prompted).
Verifying Settings
Check your TCP/IP properties in the Network window.
Linux
This section shows you how to configure your computer’s TCP/IP settings in Red Hat Linux 9.0.
Procedure, screens and file location may vary depending on your Linux distribution and release
version.
Note: Make sure you are logged in as the root administrator.
VMG4381-B10A User’s Guide
310
Appendix A Setting up Your Computer’s IP Address
Using the K Desktop Environment (KDE)
Follow the steps below to configure your computer IP address using the KDE.
Click the Red Hat button (located on the bottom left corner), select System Setting and click
Network.
Figure 177 Red Hat 9.0: KDE: Network Configuration: Devices
Double-click on the profile of the network card you wish to configure. The Ethernet Device
General screen displays as shown.
Figure 178 Red Hat 9.0: KDE: Ethernet Device: General
• If you have a dynamic IP address, click Automatically obtain IP address settings with and
select dhcp from the drop down list.
• If you have a static IP address, click Statically set IP Addresses and fill in the Address,
Subnet mask, and Default Gateway Address fields.
Click OK to save the changes and close the Ethernet Device General screen.
VMG4381-B10A User’s Guide
311
Appendix A Setting up Your Computer’s IP Address
If you know your DNS server IP address(es), click the DNS tab in the Network Configuration
screen. Enter the DNS server information in the fields provided.
Figure 179 Red Hat 9.0: KDE: Network Configuration: DNS
Click the Devices tab.
Click the Activate button to apply the changes. The following screen displays. Click Yes to save
the changes in all screens.
Figure 180 Red Hat 9.0: KDE: Network Configuration: Activate
After the network card restart process is complete, make sure the Status is Active in the Network
Configuration screen.
Using Configuration Files
Follow the steps below to edit the network configuration files and set your computer IP address.
Assuming that you have only one network card on the computer, locate the ifconfig-eth0
configuration file (where eth0 is the name of the Ethernet card). Open the configuration file with
any plain text editor.
• If you have a dynamic IP address, enter dhcp in the BOOTPROTO= field. The following figure
shows an example.
VMG4381-B10A User’s Guide
312
Appendix A Setting up Your Computer’s IP Address
Figure 181 Red Hat 9.0: Dynamic IP Address Setting in ifconfig-eth0
DEVICE=eth0
ONBOOT=yes
BOOTPROTO=dhcp
USERCTL=no
PEERDNS=yes
TYPE=Ethernet
• If you have a static IP address, enter static in the BOOTPROTO= field. Type IPADDR= followed
by the IP address (in dotted decimal notation) and type NETMASK= followed by the subnet
mask. The following example shows an example where the static IP address is 192.168.1.10
and the subnet mask is 255.255.255.0.
Figure 182 Red Hat 9.0: Static IP Address Setting in ifconfig-eth0
DEVICE=eth0
ONBOOT=yes
BOOTPROTO=static
IPADDR=192.168.1.10
NETMASK=255.255.255.0
USERCTL=no
PEERDNS=yes
TYPE=Ethernet
If you know your DNS server IP address(es), enter the DNS server information in the resolv.conf
file in the /etc directory. The following figure shows an example where two DNS server IP
addresses are specified.
Figure 183 Red Hat 9.0: DNS Settings in resolv.conf
nameserver 172.23.5.1
nameserver 172.23.5.2
After you edit and save the configuration files, you must restart the network card. Enter ./network
restart in the /etc/rc.d/init.d directory. The following figure shows an example.
Figure 184 Red Hat 9.0: Restart Ethernet Card
[root@localhost init.d]# network restart
Shutting down interface eth0:
Shutting down loopback interface:
Setting network parameters:
Bringing up loopback interface:
Bringing up interface eth0:
[OK]
[OK]
[OK]
[OK]
[OK]
Verifying Settings
Enter ifconfig in a terminal screen to check your TCP/IP properties.
VMG4381-B10A User’s Guide
313
Appendix A Setting up Your Computer’s IP Address
Figure 185 Red Hat 9.0: Checking TCP/IP Properties
[root@localhost]# ifconfig
eth0
Link encap:Ethernet HWaddr 00:50:BA:72:5B:44
inet addr:172.23.19.129 Bcast:172.23.19.255 Mask:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:717 errors:0 dropped:0 overruns:0 frame:0
TX packets:13 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:100
RX bytes:730412 (713.2 Kb) TX bytes:1570 (1.5 Kb)
Interrupt:10 Base address:0x1000
[root@localhost]#
VMG4381-B10A User’s Guide
314
A PPENDIX
IP Addresses and Subnetting
This appendix introduces IP addresses and subnet masks.
IP addresses identify individual devices on a network. Every networking device (including
computers, servers, routers, printers, etc.) needs an IP address to communicate across the
network. These networking devices are also known as hosts.
Subnet masks determine the maximum number of possible hosts on a network. You can also use
subnet masks to divide one network into multiple sub-networks.
Introduction to IP Addresses
One part of the IP address is the network number, and the other part is the host ID. In the same
way that houses on a street share a common street name, the hosts on a network share a common
network number. Similarly, as each house has its own house number, each host on the network has
its own unique identifying number - the host ID. Routers use the network number to send packets
to the correct network, while the host ID determines to which host on the network the packets are
delivered.
Structure
An IP address is made up of four parts, written in dotted decimal notation (for example,
192.168.1.1). Each of these four parts is known as an octet. An octet is an eight-digit binary
number (for example 11000000, which is 192 in decimal notation).
Therefore, each octet has a possible range of 00000000 to 11111111 in binary, or 0 to 255 in
decimal.
The following figure shows an example IP address in which the first three octets (192.168.1) are
the network number, and the fourth octet (16) is the host ID.
VMG4381-B10A User’s Guide
315
Appendix B IP Addresses and Subnetting
Figure 186 Network Number and Host ID
How much of the IP address is the network number and how much is the host ID varies according
to the subnet mask.
Subnet Masks
A subnet mask is used to determine which bits are part of the network number, and which bits are
part of the host ID (using a logical AND operation). The term “subnet” is short for “sub-network”.
A subnet mask has 32 bits. If a bit in the subnet mask is a “1” then the corresponding bit in the IP
address is part of the network number. If a bit in the subnet mask is “0” then the corresponding bit
in the IP address is part of the host ID.
The following example shows a subnet mask identifying the network number (in bold text) and host
ID of an IP address (192.168.1.2 in decimal).
Table 116 Subnet Masks
1ST OCTET: 2ND
OCTET:
(192)
(168)
3RD
OCTET:
4TH OCTET
(1)
(2)
IP Address (Binary)
11000000
10101000
00000001
00000010
Subnet Mask (Binary)
11111111
11111111
11111111
00000000
Network Number
11000000
10101000
00000001
Host ID
00000010
By convention, subnet masks always consist of a continuous sequence of ones beginning from the
leftmost bit of the mask, followed by a continuous sequence of zeros, for a total number of 32 bits.
Subnet masks can be referred to by the size of the network number part (the bits with a “1” value).
For example, an “8-bit mask” means that the first 8 bits of the mask are ones and the remaining 24
bits are zeroes.
VMG4381-B10A User’s Guide
316
Appendix B IP Addresses and Subnetting
Subnet masks are expressed in dotted decimal notation just like IP addresses. The following
examples show the binary and decimal notation for 8-bit, 16-bit, 24-bit and 29-bit subnet masks.
Table 117 Subnet Masks
BINARY
DECIMAL
1ST
OCTET
2ND
OCTET
3RD
OCTET
4TH OCTET
8-bit mask
11111111
00000000
00000000
00000000
255.0.0.0
16-bit mask
11111111
11111111
00000000
00000000
255.255.0.0
24-bit mask
11111111
11111111
11111111
00000000
255.255.255.0
29-bit mask
11111111
11111111
11111111
11111000
255.255.255.248
Network Size
The size of the network number determines the maximum number of possible hosts you can have
on your network. The larger the number of network number bits, the smaller the number of
remaining host ID bits.
An IP address with host IDs of all zeros is the IP address of the network (192.168.1.0 with a 24-bit
subnet mask, for example). An IP address with host IDs of all ones is the broadcast address for that
network (192.168.1.255 with a 24-bit subnet mask, for example).
As these two IP addresses cannot be used for individual hosts, calculate the maximum number of
possible hosts in a network as follows:
Table 118 Maximum Host Numbers
SUBNET MASK
8 bits
HOST ID SIZE
255.0.0.0
MAXIMUM NUMBER OF HOSTS
24 bits
24
–2
16777214
16
–2
65534
16 bits
255.255.0.0
16 bits
24 bits
255.255.255.0
8 bits
28 – 2
254
3 bits
23
29 bits
255.255.255.24
–2
Notation
Since the mask is always a continuous number of ones beginning from the left, followed by a
continuous number of zeros for the remainder of the 32 bit mask, you can simply specify the
number of ones instead of writing the value of each octet. This is usually specified by writing a “/”
followed by the number of bits in the mask after the address.
For example, 192.1.1.0 /25 is equivalent to saying 192.1.1.0 with subnet mask 255.255.255.128.
The following table shows some possible subnet masks using both notations.
Table 119 Alternative Subnet Mask Notation
SUBNET MASK
ALTERNATIVE
NOTATION
LAST OCTET
(BINARY)
LAST OCTET
(DECIMAL)
255.255.255.0
/24
0000 0000
255.255.255.128
/25
1000 0000
128
255.255.255.192
/26
1100 0000
192
VMG4381-B10A User’s Guide
317
Appendix B IP Addresses and Subnetting
Table 119 Alternative Subnet Mask Notation (continued)
SUBNET MASK
ALTERNATIVE
NOTATION
LAST OCTET
(BINARY)
LAST OCTET
(DECIMAL)
255.255.255.224
/27
1110 0000
224
255.255.255.240
/28
1111 0000
240
255.255.255.248
/29
1111 1000
248
255.255.255.252
/30
1111 1100
252
Subnetting
You can use subnetting to divide one network into multiple sub-networks. In the following example
a network administrator creates two sub-networks to isolate a group of servers from the rest of the
company network for security reasons.
In this example, the company network address is 192.168.1.0. The first three octets of the address
(192.168.1) are the network number, and the remaining octet is the host ID, allowing a maximum
of 28 – 2 or 254 possible hosts.
The following figure shows the company network before subnetting.
Figure 187 Subnetting Example: Before Subnetting
You can “borrow” one of the host ID bits to divide the network 192.168.1.0 into two separate subnetworks. The subnet mask is now 25 bits (255.255.255.128 or /25).
The “borrowed” host ID bit can have a value of either 0 or 1, allowing two subnets; 192.168.1.0 /25
and 192.168.1.128 /25.
The following figure shows the company network after subnetting. There are now two subnetworks, A and B.
VMG4381-B10A User’s Guide
318
Appendix B IP Addresses and Subnetting
Figure 188 Subnetting Example: After Subnetting
In a 25-bit subnet the host ID has 7 bits, so each sub-network has a maximum of 27 – 2 or 126
possible hosts (a host ID of all zeroes is the subnet’s address itself, all ones is the subnet’s
broadcast address).
192.168.1.0 with mask 255.255.255.128 is subnet A itself, and 192.168.1.127 with mask
255.255.255.128 is its broadcast address. Therefore, the lowest IP address that can be assigned to
an actual host for subnet A is 192.168.1.1 and the highest is 192.168.1.126.
Similarly, the host ID range for subnet B is 192.168.1.129 to 192.168.1.254.
Example: Four Subnets
The previous example illustrated using a 25-bit subnet mask to divide a 24-bit address into two
subnets. Similarly, to divide a 24-bit address into four subnets, you need to “borrow” two host ID
bits to give four possible combinations (00, 01, 10 and 11). The subnet mask is 26 bits
(11111111.11111111.11111111.11000000) or 255.255.255.192.
Each subnet contains 6 host ID bits, giving 26 - 2 or 62 hosts for each subnet (a host ID of all
zeroes is the subnet itself, all ones is the subnet’s broadcast address).
Table 120 Subnet 1
IP/SUBNET MASK
NETWORK NUMBER
LAST OCTET BIT
VALUE
IP Address (Decimal)
192.168.1.
IP Address (Binary)
11000000.10101000.00000001.
00000000
Subnet Mask (Binary)
11111111.11111111.11111111.
11000000
Subnet Address:
192.168.1.0
Lowest Host ID: 192.168.1.1
Broadcast Address:
192.168.1.63
Highest Host ID: 192.168.1.62
VMG4381-B10A User’s Guide
319
Appendix B IP Addresses and Subnetting
Table 121 Subnet 2
IP/SUBNET MASK
NETWORK NUMBER
LAST OCTET BIT
VALUE
IP Address
192.168.1.
64
IP Address (Binary)
11000000.10101000.00000001.
01000000
Subnet Mask (Binary)
11111111.11111111.11111111.
11000000
Subnet Address:
192.168.1.64
Lowest Host ID: 192.168.1.65
Broadcast Address:
192.168.1.127
Highest Host ID: 192.168.1.126
Table 122 Subnet 3
IP/SUBNET MASK
NETWORK NUMBER
LAST OCTET BIT VALUE
IP Address
192.168.1.
128
IP Address (Binary)
11000000.10101000.00000001.
10000000
Subnet Mask (Binary)
11111111.11111111.11111111.
11000000
Subnet Address:
192.168.1.128
Lowest Host ID: 192.168.1.129
Broadcast Address:
192.168.1.191
Highest Host ID: 192.168.1.190
Table 123 Subnet 4
IP/SUBNET MASK
NETWORK NUMBER
LAST OCTET BIT VALUE
IP Address
192.168.1.
192
IP Address (Binary)
11000000.10101000.00000001.
11000000
Subnet Mask (Binary)
11111111.11111111.11111111.
11000000
Subnet Address:
192.168.1.192
Lowest Host ID: 192.168.1.193
Broadcast Address:
192.168.1.255
Highest Host ID: 192.168.1.254
Example: Eight Subnets
Similarly, use a 27-bit mask to create eight subnets (000, 001, 010, 011, 100, 101, 110 and 111).
The following table shows IP address last octet values for each subnet.
Table 124 Eight Subnets
SUBNET
SUBNET
ADDRESS
FIRST ADDRESS
LAST
ADDRESS
BROADCAST
ADDRESS
30
31
32
33
62
63
64
65
94
95
96
97
126
127
128
129
158
159
160
161
190
191
192
193
222
223
224
225
254
255
VMG4381-B10A User’s Guide
320
Appendix B IP Addresses and Subnetting
Subnet Planning
The following table is a summary for subnet planning on a network with a 24-bit network number.
Table 125 24-bit Network Number Subnet Planning
NO. “BORROWED”
HOST BITS
SUBNET MASK
NO. SUBNETS
NO. HOSTS PER
SUBNET
255.255.255.128 (/25)
126
255.255.255.192 (/26)
62
255.255.255.224 (/27)
30
255.255.255.240 (/28)
16
14
255.255.255.248 (/29)
32
255.255.255.252 (/30)
64
255.255.255.254 (/31)
128
The following table is a summary for subnet planning on a network with a 16-bit network number.
Table 126 16-bit Network Number Subnet Planning
NO. “BORROWED”
HOST BITS
SUBNET MASK
NO. SUBNETS
NO. HOSTS PER
SUBNET
255.255.128.0 (/17)
32766
255.255.192.0 (/18)
16382
255.255.224.0 (/19)
8190
255.255.240.0 (/20)
16
4094
255.255.248.0 (/21)
32
2046
255.255.252.0 (/22)
64
1022
255.255.254.0 (/23)
128
510
255.255.255.0 (/24)
256
254
255.255.255.128 (/25)
512
126
10
255.255.255.192 (/26)
1024
62
11
255.255.255.224 (/27)
2048
30
12
255.255.255.240 (/28)
4096
14
13
255.255.255.248 (/29)
8192
14
255.255.255.252 (/30)
16384
15
255.255.255.254 (/31)
32768
Configuring IP Addresses
Where you obtain your network number depends on your particular situation. If the ISP or your
network administrator assigns you a block of registered IP addresses, follow their instructions in
selecting the IP addresses and the subnet mask.
If the ISP did not explicitly give you an IP network number, then most likely you have a single user
account and the ISP will assign you a dynamic IP address when the connection is established. If this
is the case, it is recommended that you select a network number from 192.168.0.0 to
192.168.255.0. The Internet Assigned Number Authority (IANA) reserved this block of addresses
specifically for private use; please do not use any other number unless you are told otherwise. You
must also enable Network Address Translation (NAT) on the Device.
VMG4381-B10A User’s Guide
321
Appendix B IP Addresses and Subnetting
Once you have decided on the network number, pick an IP address for your Device that is easy to
remember (for instance, 192.168.1.1) but make sure that no other device on your network is using
that IP address.
The subnet mask specifies the network number portion of an IP address. Your Device will compute
the subnet mask automatically based on the IP address that you entered. You don't need to change
the subnet mask computed by the Device unless you are instructed to do otherwise.
Private IP Addresses
Every machine on the Internet must have a unique address. If your networks are isolated from the
Internet (running only between two branch offices, for example) you can assign any IP addresses to
the hosts without problems. However, the Internet Assigned Numbers Authority (IANA) has
reserved the following three blocks of IP addresses specifically for private networks:
• 10.0.0.0
• 172.16.0.0
— 10.255.255.255
— 172.31.255.255
• 192.168.0.0 — 192.168.255.255
You can obtain your IP address from the IANA, from an ISP, or it can be assigned from a private
network. If you belong to a small organization and your Internet access is through an ISP, the ISP
can provide you with the Internet addresses for your local networks. On the other hand, if you are
part of a much larger organization, you should consult your network administrator for the
appropriate IP addresses.
Regardless of your particular situation, do not create an arbitrary IP address; always follow the
guidelines above. For more information on address assignment, please refer to RFC 1597, Address
Allocation for Private Internets and RFC 1466, Guidelines for Management of IP Address Space.
VMG4381-B10A User’s Guide
322
A PPENDIX
Pop-up Windows, JavaScripts and Java
Permissions
In order to use the web configurator you need to allow:
• Web browser pop-up windows from your device.
• JavaScripts (enabled by default).
• Java permissions (enabled by default).
Note: Internet Explorer 6 screens are used here. Screens for other Internet Explorer
versions may vary.
Internet Explorer Pop-up Blockers
You may have to disable pop-up blocking to log into your device.
Either disable pop-up blocking (enabled by default in Windows XP SP (Service Pack) 2) or allow
pop-up blocking and create an exception for your device’s IP address.
Disable Pop-up Blockers
In Internet Explorer, select Tools, Pop-up Blocker and then select Turn Off Pop-up Blocker.
Figure 189 Pop-up Blocker
You can also check if pop-up blocking is disabled in the Pop-up Blocker section in the Privacy tab.
In Internet Explorer, select Tools, Internet Options, Privacy.
Clear the Block pop-ups check box in the Pop-up Blocker section of the screen. This disables any
web pop-up blockers you may have enabled.
VMG4381-B10A User’s Guide
323
Appendix C Pop-up Windows, JavaScripts and Java Permissions
Figure 190 Internet Options: Privacy
Click Apply to save this setting.
Enable Pop-up Blockers with Exceptions
Alternatively, if you only want to allow pop-up windows from your device, see the following steps.
In Internet Explorer, select Tools, Internet Options and then the Privacy tab.
Select Settings…to open the Pop-up Blocker Settings screen.
VMG4381-B10A User’s Guide
324
Appendix C Pop-up Windows, JavaScripts and Java Permissions
Figure 191 Internet Options: Privacy
Type the IP address of your device (the web page that you do not want to have blocked) with the
prefix “http://”. For example, http://192.168.167.1.
Click Add to move the IP address to the list of Allowed sites.
Figure 192 Pop-up Blocker Settings
VMG4381-B10A User’s Guide
325
Appendix C Pop-up Windows, JavaScripts and Java Permissions
Click Close to return to the Privacy screen.
Click Apply to save this setting.
JavaScripts
If pages of the web configurator do not display properly in Internet Explorer, check that JavaScripts
are allowed.
In Internet Explorer, click Tools, Internet Options and then the Security tab.
Figure 193 Internet Options: Security
Click the Custom Level... button.
Scroll down to Scripting.
Under Active scripting make sure that Enable is selected (the default).
Under Scripting of Java applets make sure that Enable is selected (the default).
Click OK to close the window.
VMG4381-B10A User’s Guide
326
Appendix C Pop-up Windows, JavaScripts and Java Permissions
Figure 194 Security Settings - Java Scripting
Java Permissions
From Internet Explorer, click Tools, Internet Options and then the Security tab.
Click the Custom Level... button.
Scroll down to Microsoft VM.
Under Java permissions make sure that a safety level is selected.
Click OK to close the window.
VMG4381-B10A User’s Guide
327
Appendix C Pop-up Windows, JavaScripts and Java Permissions
Figure 195 Security Settings - Java
JAVA (Sun)
From Internet Explorer, click Tools, Internet Options and then the Advanced tab.
Make sure that Use Java 2 for  under Java (Sun) is selected.
Click OK to close the window.
Figure 196 Java (Sun)
VMG4381-B10A User’s Guide
328
Appendix C Pop-up Windows, JavaScripts and Java Permissions
Mozilla Firefox
Mozilla Firefox 2.0 screens are used here. Screens for other versions may vary.
You can enable Java, Javascripts and pop-ups in one screen. Click Tools, then click Options in the
screen that appears.
Figure 197 Mozilla Firefox: Tools > Options
Click Content.to show the screen below. Select the check boxes as shown in the following screen.
Figure 198 Mozilla Firefox Content Security
VMG4381-B10A User’s Guide
329
Appendix C Pop-up Windows, JavaScripts and Java Permissions
VMG4381-B10A User’s Guide
330
A PPENDIX
Wireless LANs
Wireless LAN Topologies
This section discusses ad-hoc and infrastructure wireless LAN topologies.
Ad-hoc Wireless LAN Configuration
The simplest WLAN configuration is an independent (Ad-hoc) WLAN that connects a set of
computers with wireless adapters (A, B, C). Any time two or more wireless adapters are within
range of each other, they can set up an independent network, which is commonly referred to as an
ad-hoc network or Independent Basic Service Set (IBSS). The following diagram shows an example
of notebook computers using wireless adapters to form an ad-hoc wireless LAN.
Figure 199 Peer-to-Peer Communication in an Ad-hoc Network
BSS
A Basic Service Set (BSS) exists when all communications between wireless clients or between a
wireless client and a wired network client go through one access point (AP).
Intra-BSS traffic is traffic between wireless clients in the BSS. When Intra-BSS is enabled, wireless
client A and B can access the wired network and communicate with each other. When Intra-BSS is
disabled, wireless client A and B can still access the wired network but cannot communicate with
each other.
VMG4381-B10A User’s Guide
331
Appendix D Wireless LANs
Figure 200 Basic Service Set
ESS
An Extended Service Set (ESS) consists of a series of overlapping BSSs, each containing an access
point, with each access point connected together by a wired network. This wired connection
between APs is called a Distribution System (DS).
This type of wireless LAN topology is called an Infrastructure WLAN. The Access Points not only
provide communication with the wired network but also mediate wireless network traffic in the
immediate neighborhood.
An ESSID (ESS IDentification) uniquely identifies each ESS. All access points and their associated
wireless clients within the same ESS must have the same ESSID in order to communicate.
VMG4381-B10A User’s Guide
332
Appendix D Wireless LANs
Figure 201 Infrastructure WLAN
Channel
A channel is the radio frequency(ies) used by wireless devices to transmit and receive data.
Channels available depend on your geographical area. You may have a choice of channels (for your
region) so you should use a channel different from an adjacent AP (access point) to reduce
interference. Interference occurs when radio signals from different access points overlap causing
interference and degrading performance.
Adjacent channels partially overlap however. To avoid interference due to overlap, your AP should
be on a channel at least five channels away from a channel that an adjacent AP is using. For
example, if your region has 11 channels and an adjacent AP is using channel 1, then you need to
select a channel between 6 or 11.
RTS/CTS
A hidden node occurs when two stations are within range of the same access point, but are not
within range of each other. The following figure illustrates a hidden node. Both stations (STA) are
within range of the access point (AP) or wireless gateway, but out-of-range of each other, so they
cannot "hear" each other, that is they do not know if the channel is currently being used. Therefore,
they are considered hidden from each other.
VMG4381-B10A User’s Guide
333
Appendix D Wireless LANs
Figure 202
RTS/CTS
When station A sends data to the AP, it might not know that the station B is already using the
channel. If these two stations send data at the same time, collisions may occur when both sets of
data arrive at the AP at the same time, resulting in a loss of messages for both stations.
RTS/CTS is designed to prevent collisions due to hidden nodes. An RTS/CTS defines the biggest
size data frame you can send before an RTS (Request To Send)/CTS (Clear to Send) handshake is
invoked.
When a data frame exceeds the RTS/CTS value you set (between 0 to 2432 bytes), the station
that wants to transmit this frame must first send an RTS (Request To Send) message to the AP for
permission to send it. The AP then responds with a CTS (Clear to Send) message to all other
stations within its range to notify them to defer their transmission. It also reserves and confirms
with the requesting station the time frame for the requested transmission.
Stations can send frames smaller than the specified RTS/CTS directly to the AP without the RTS
(Request To Send)/CTS (Clear to Send) handshake.
You should only configure RTS/CTS if the possibility of hidden nodes exists on your network and
the "cost" of resending large frames is more than the extra network overhead involved in the RTS
(Request To Send)/CTS (Clear to Send) handshake.
If the RTS/CTS value is greater than the Fragmentation Threshold value (see next), then the
RTS (Request To Send)/CTS (Clear to Send) handshake will never occur as data frames will be
fragmented before they reach RTS/CTS size.
Note: Enabling the RTS Threshold causes redundant network overhead that could
negatively affect the throughput performance instead of providing a remedy.
Fragmentation Threshold
A Fragmentation Threshold is the maximum data fragment size (between 256 and 2432 bytes)
that can be sent in the wireless network before the AP will fragment the packet into smaller data
frames.
A large Fragmentation Threshold is recommended for networks not prone to interference while
you should set a smaller threshold for busy networks or networks that are prone to interference.
If the Fragmentation Threshold value is smaller than the RTS/CTS value (see previously) you
set then the RTS (Request To Send)/CTS (Clear to Send) handshake will never occur as data frames
will be fragmented before they reach RTS/CTS size.
VMG4381-B10A User’s Guide
334
Appendix D Wireless LANs
IEEE 802.11g Wireless LAN
IEEE 802.11g is fully compatible with the IEEE 802.11b standard. This means an IEEE 802.11b
adapter can interface directly with an IEEE 802.11g access point (and vice versa) at 11 Mbps or
lower depending on range. IEEE 802.11g has several intermediate rate steps between the
maximum and minimum data rates. The IEEE 802.11g data rate and modulation are as follows:
Table 127 IEEE 802.11g
DATA RATE (MBPS)
MODULATION
DBPSK (Differential Binary Phase Shift Keyed)
DQPSK (Differential Quadrature Phase Shift Keying)
5.5 / 11
CCK (Complementary Code Keying)
6/9/12/18/24/36/48/
54
OFDM (Orthogonal Frequency Division Multiplexing)
Wireless Security Overview
Wireless security is vital to your network to protect wireless communication between wireless
clients, access points and the wired network.
Wireless security methods available on the Device are data encryption, wireless client
authentication, restricting access by device MAC address and hiding the Device identity.
The following figure shows the relative effectiveness of these wireless security methods available on
your Device.
Table 128 Wireless Security Levels
SECURITY
LEVEL
Least
Secure
SECURITY TYPE
Unique SSID (Default)
Unique SSID with Hide SSID Enabled
MAC Address Filtering
WEP Encryption
IEEE802.1x EAP with RADIUS Server Authentication
Wi-Fi Protected Access (WPA)
WPA2
Most Secure
Note: You must enable the same wireless security settings on the Device and on all
wireless clients that you want to associate with it.
IEEE 802.1x
In June 2001, the IEEE 802.1x standard was designed to extend the features of IEEE 802.11 to
support extended authentication as well as providing additional accounting and control features. It
is supported by Windows XP and a number of network devices. Some advantages of IEEE 802.1x
are:
VMG4381-B10A User’s Guide
335
Appendix D Wireless LANs
• User based identification that allows for roaming.
• Support for RADIUS (Remote Authentication Dial In User Service, RFC 2138, 2139) for
centralized user profile and accounting management on a network RADIUS server.
• Support for EAP (Extensible Authentication Protocol, RFC 2486) that allows additional
authentication methods to be deployed with no changes to the access point or the wireless
clients.
RADIUS
RADIUS is based on a client-server model that supports authentication, authorization and
accounting. The access point is the client and the server is the RADIUS server. The RADIUS server
handles the following tasks:
• Authentication
Determines the identity of the users.
• Authorization
Determines the network services available to authenticated users once they are connected to the
network.
• Accounting
Keeps track of the client’s network activity.
RADIUS is a simple package exchange in which your AP acts as a message relay between the
wireless client and the network RADIUS server.
Types of RADIUS Messages
The following types of RADIUS messages are exchanged between the access point and the RADIUS
server for user authentication:
• Access-Request
Sent by an access point requesting authentication.
• Access-Reject
Sent by a RADIUS server rejecting access.
• Access-Accept
Sent by a RADIUS server allowing access.
• Access-Challenge
Sent by a RADIUS server requesting more information in order to allow access. The access point
sends a proper response from the user and then sends another Access-Request message.
The following types of RADIUS messages are exchanged between the access point and the RADIUS
server for user accounting:
• Accounting-Request
Sent by the access point requesting accounting.
• Accounting-Response
Sent by the RADIUS server to indicate that it has started or stopped accounting.
VMG4381-B10A User’s Guide
336
Appendix D Wireless LANs
In order to ensure network security, the access point and the RADIUS server use a shared secret
key, which is a password, they both know. The key is not sent over the network. In addition to the
shared key, password information exchanged is also encrypted to protect the network from
unauthorized access.
Types of EAP Authentication
This section discusses some popular authentication types: EAP-MD5, EAP-TLS, EAP-TTLS, PEAP and
LEAP. Your wireless LAN device may not support all authentication types.
EAP (Extensible Authentication Protocol) is an authentication protocol that runs on top of the IEEE
802.1x transport mechanism in order to support multiple types of user authentication. By using EAP
to interact with an EAP-compatible RADIUS server, an access point helps a wireless station and a
RADIUS server perform authentication.
The type of authentication you use depends on the RADIUS server and an intermediary AP(s) that
supports IEEE 802.1x.
For EAP-TLS authentication type, you must first have a wired connection to the network and obtain
the certificate(s) from a certificate authority (CA). A certificate (also called digital IDs) can be used
to authenticate users and a CA issues certificates and guarantees the identity of each certificate
owner.
EAP-MD5 (Message-Digest Algorithm 5)
MD5 authentication is the simplest one-way authentication method. The authentication server
sends a challenge to the wireless client. The wireless client ‘proves’ that it knows the password by
encrypting the password with the challenge and sends back the information. Password is not sent in
plain text.
However, MD5 authentication has some weaknesses. Since the authentication server needs to get
the plaintext passwords, the passwords must be stored. Thus someone other than the
authentication server may access the password file. In addition, it is possible to impersonate an
authentication server as MD5 authentication method does not perform mutual authentication.
Finally, MD5 authentication method does not support data encryption with dynamic session key. You
must configure WEP encryption keys for data encryption.
EAP-TLS (Transport Layer Security)
With EAP-TLS, digital certifications are needed by both the server and the wireless clients for
mutual authentication. The server presents a certificate to the client. After validating the identity of
the server, the client sends a different certificate to the server. The exchange of certificates is done
in the open before a secured tunnel is created. This makes user identity vulnerable to passive
attacks. A digital certificate is an electronic ID card that authenticates the sender’s identity.
However, to implement EAP-TLS, you need a Certificate Authority (CA) to handle certificates, which
imposes a management overhead.
EAP-TTLS (Tunneled Transport Layer Service)
EAP-TTLS is an extension of the EAP-TLS authentication that uses certificates for only the serverside authentications to establish a secure connection. Client authentication is then done by sending
username and password through the secure connection, thus client identity is protected. For client
VMG4381-B10A User’s Guide
337
Appendix D Wireless LANs
authentication, EAP-TTLS supports EAP methods and legacy authentication methods such as PAP,
CHAP, MS-CHAP and MS-CHAP v2.
PEAP (Protected EAP)
Like EAP-TTLS, server-side certificate authentication is used to establish a secure connection, then
use simple username and password methods through the secured connection to authenticate the
clients, thus hiding client identity. However, PEAP only supports EAP methods, such as EAP-MD5,
EAP-MSCHAPv2 and EAP-GTC (EAP-Generic Token Card), for client authentication. EAP-GTC is
implemented only by Cisco.
LEAP
LEAP (Lightweight Extensible Authentication Protocol) is a Cisco implementation of IEEE 802.1x.
Dynamic WEP Key Exchange
The AP maps a unique key that is generated with the RADIUS server. This key expires when the
wireless connection times out, disconnects or reauthentication times out. A new WEP key is
generated each time reauthentication is performed.
If this feature is enabled, it is not necessary to configure a default encryption key in the wireless
security configuration screen. You may still configure and store keys, but they will not be used while
dynamic WEP is enabled.
Note: EAP-MD5 cannot be used with Dynamic WEP Key Exchange
For added security, certificate-based authentications (EAP-TLS, EAP-TTLS and PEAP) use dynamic
keys for data encryption. They are often deployed in corporate environments, but for public
deployment, a simple user name and password pair is more practical. The following table is a
comparison of the features of authentication types.
Table 129 Comparison of EAP Authentication Types
EAP-MD5
EAP-TLS
EAP-TTLS
PEAP
LEAP
Mutual Authentication
No
Yes
Yes
Yes
Yes
Certificate – Client
No
Yes
Optional
Optional
No
Certificate – Server
No
Yes
Yes
Yes
No
Dynamic Key Exchange
No
Yes
Yes
Yes
Yes
Credential Integrity
None
Strong
Strong
Strong
Moderate
Deployment Difficulty
Easy
Hard
Moderate
Moderate
Moderate
Client Identity Protection
No
No
Yes
Yes
No
WPA and WPA2
Wi-Fi Protected Access (WPA) is a subset of the IEEE 802.11i standard. WPA2 (IEEE 802.11i) is a
wireless security standard that defines stronger encryption, authentication and key management
than WPA.
Key differences between WPA or WPA2 and WEP are improved data encryption and user
authentication.
VMG4381-B10A User’s Guide
338
Appendix D Wireless LANs
If both an AP and the wireless clients support WPA2 and you have an external RADIUS server, use
WPA2 for stronger data encryption. If you don't have an external RADIUS server, you should use
WPA2-PSK (WPA2-Pre-Shared Key) that only requires a single (identical) password entered into
each access point, wireless gateway and wireless client. As long as the passwords match, a wireless
client will be granted access to a WLAN.
If the AP or the wireless clients do not support WPA2, just use WPA or WPA-PSK depending on
whether you have an external RADIUS server or not.
Select WEP only when the AP and/or wireless clients do not support WPA or WPA2. WEP is less
secure than WPA or WPA2.
Encryption
WPA improves data encryption by using Temporal Key Integrity Protocol (TKIP), Message Integrity
Check (MIC) and IEEE 802.1x. WPA2 also uses TKIP when required for compatibility reasons, but
offers stronger encryption than TKIP with Advanced Encryption Standard (AES) in the Counter
mode with Cipher block chaining Message authentication code Protocol (CCMP).
TKIP uses 128-bit keys that are dynamically generated and distributed by the authentication server.
AES (Advanced Encryption Standard) is a block cipher that uses a 256-bit mathematical algorithm
called Rijndael. They both include a per-packet key mixing function, a Message Integrity Check
(MIC) named Michael, an extended initialization vector (IV) with sequencing rules, and a re-keying
mechanism.
WPA and WPA2 regularly change and rotate the encryption keys so that the same encryption key is
never used twice.
The RADIUS server distributes a Pairwise Master Key (PMK) key to the AP that then sets up a key
hierarchy and management system, using the PMK to dynamically generate unique data encryption
keys to encrypt every data packet that is wirelessly communicated between the AP and the wireless
clients. This all happens in the background automatically.
The Message Integrity Check (MIC) is designed to prevent an attacker from capturing data packets,
altering them and resending them. The MIC provides a strong mathematical function in which the
receiver and the transmitter each compute and then compare the MIC. If they do not match, it is
assumed that the data has been tampered with and the packet is dropped.
By generating unique data encryption keys for every data packet and by creating an integrity
checking mechanism (MIC), with TKIP and AES it is more difficult to decrypt data on a Wi-Fi
network than WEP and difficult for an intruder to break into the network.
The encryption mechanisms used for WPA(2) and WPA(2)-PSK are the same. The only difference
between the two is that WPA(2)-PSK uses a simple common password, instead of user-specific
credentials. The common-password approach makes WPA(2)-PSK susceptible to brute-force
password-guessing attacks but it’s still an improvement over WEP as it employs a consistent,
single, alphanumeric password to derive a PMK which is used to generate unique temporal
encryption keys. This prevent all wireless devices sharing the same encryption keys. (a weakness of
WEP)
User Authentication
WPA and WPA2 apply IEEE 802.1x and Extensible Authentication Protocol (EAP) to authenticate
wireless clients using an external RADIUS database. WPA2 reduces the number of key exchange
VMG4381-B10A User’s Guide
339
Appendix D Wireless LANs
messages from six to four (CCMP 4-way handshake) and shortens the time required to connect to a
network. Other WPA2 authentication features that are different from WPA include key caching and
pre-authentication. These two features are optional and may not be supported in all wireless
devices.
Key caching allows a wireless client to store the PMK it derived through a successful authentication
with an AP. The wireless client uses the PMK when it tries to connect to the same AP and does not
need to go with the authentication process again.
Pre-authentication enables fast roaming by allowing the wireless client (already connecting to an
AP) to perform IEEE 802.1x authentication with another AP before connecting to it.
Wireless Client WPA Supplicants
A wireless client supplicant is the software that runs on an operating system instructing the wireless
client how to use WPA. At the time of writing, the most widely available supplicant is the WPA patch
for Windows XP, Funk Software's Odyssey client.
The Windows XP patch is a free download that adds WPA capability to Windows XP's built-in "Zero
Configuration" wireless client. However, you must run Windows XP to use it.
WPA(2) with RADIUS Application Example
To set up WPA(2), you need the IP address of the RADIUS server, its port number (default is 1812),
and the RADIUS shared secret. A WPA(2) application example with an external RADIUS server
looks as follows. "A" is the RADIUS server. "DS" is the distribution system.
The AP passes the wireless client's authentication request to the RADIUS server.
The RADIUS server then checks the user's identification against its database and grants or denies
network access accordingly.
A 256-bit Pairwise Master Key (PMK) is derived from the authentication process by the RADIUS
server and the client.
The RADIUS server distributes the PMK to the AP. The AP then sets up a key hierarchy and
management system, using the PMK to dynamically generate unique data encryption keys. The
keys are used to encrypt every data packet that is wirelessly communicated between the AP and
the wireless clients.
VMG4381-B10A User’s Guide
340
Appendix D Wireless LANs
Figure 203 WPA(2) with RADIUS Application Example
WPA(2)-PSK Application Example
A WPA(2)-PSK application looks as follows.
First enter identical passwords into the AP and all wireless clients. The Pre-Shared Key (PSK) must
consist of between 8 and 63 ASCII characters or 64 hexadecimal characters (including spaces and
symbols).
The AP checks each wireless client's password and allows it to join the network only if the password
matches.
The AP and wireless clients generate a common PMK (Pairwise Master Key). The key itself is not
sent over the network, but is derived from the PSK and the SSID.
The AP and wireless clients use the TKIP or AES encryption process, the PMK and information
exchanged in a handshake to create temporal encryption keys. They use these keys to encrypt data
exchanged between them.
Figure 204 WPA(2)-PSK Authentication
VMG4381-B10A User’s Guide
341
Appendix D Wireless LANs
Security Parameters Summary
Refer to this table to see what other security parameters you should configure for each
authentication method or key management protocol type. MAC address filters are not dependent on
how you configure these security features.
Table 130 Wireless Security Relational Matrix
AUTHENTICATION
ENCRYPTIO
METHOD/ KEY
MANAGEMENT PROTOCOL N METHOD
ENTER
MANUAL KEY
IEEE 802.1X
Open
No
Disable
None
Enable without Dynamic WEP Key
Open
Shared
WEP
WEP
No
Enable with Dynamic WEP Key
Yes
Enable without Dynamic WEP Key
Yes
Disable
No
Enable with Dynamic WEP Key
Yes
Enable without Dynamic WEP Key
Yes
Disable
WPA
TKIP/AES
No
Enable
WPA-PSK
TKIP/AES
Yes
Disable
WPA2
TKIP/AES
No
Enable
WPA2-PSK
TKIP/AES
Yes
Disable
Antenna Overview
An antenna couples RF signals onto air. A transmitter within a wireless device sends an RF signal to
the antenna, which propagates the signal through the air. The antenna also operates in reverse by
capturing RF signals from the air.
Positioning the antennas properly increases the range and coverage area of a wireless LAN.
Antenna Characteristics
Frequency
An antenna in the frequency of 2.4GHz (IEEE 802.11b and IEEE 802.11g) or 5GHz (IEEE 802.11a)
is needed to communicate efficiently in a wireless LAN
Radiation Pattern
A radiation pattern is a diagram that allows you to visualize the shape of the antenna’s coverage
area.
Antenna Gain
Antenna gain, measured in dB (decibel), is the increase in coverage within the RF beam width.
Higher antenna gain improves the range of the signal for better communications.
For an indoor site, each 1 dB increase in antenna gain results in a range increase of approximately
VMG4381-B10A User’s Guide
342
Appendix D Wireless LANs
2.5%. For an unobstructed outdoor site, each 1dB increase in gain results in a range increase of
approximately 5%. Actual results may vary depending on the network environment.
Antenna gain is sometimes specified in dBi, which is how much the antenna increases the signal
power compared to using an isotropic antenna. An isotropic antenna is a theoretical perfect antenna
that sends out radio signals equally well in all directions. dBi represents the true gain that the
antenna provides.
Types of Antennas for WLAN
There are two types of antennas used for wireless LAN applications.
• Omni-directional antennas send the RF signal out in all directions on a horizontal plane. The
coverage area is torus-shaped (like a donut) which makes these antennas ideal for a room
environment. With a wide coverage area, it is possible to make circular overlapping coverage
areas with multiple access points.
• Directional antennas concentrate the RF signal in a beam, like a flashlight does with the light
from its bulb. The angle of the beam determines the width of the coverage pattern. Angles
typically range from 20 degrees (very directional) to 120 degrees (less directional). Directional
antennas are ideal for hallways and outdoor point-to-point applications.
Positioning Antennas
In general, antennas should be mounted as high as practically possible and free of obstructions. In
point-to–point application, position both antennas at the same height and in a direct line of sight to
each other to attain the best performance.
For omni-directional antennas mounted on a table, desk, and so on, point the antenna up. For
omni-directional antennas mounted on a wall or ceiling, point the antenna down. For a single AP
application, place omni-directional antennas as close to the center of the coverage area as possible.
For directional antennas, point the antenna in the direction of the desired coverage area.
VMG4381-B10A User’s Guide
343
Appendix D Wireless LANs
VMG4381-B10A User’s Guide
344
A PPENDIX
IPv6
Overview
IPv6 (Internet Protocol version 6), is designed to enhance IP address size and features. The
increase in IPv6 address size to 128 bits (from the 32-bit IPv4 address) allows up to 3.4 x 1038 IP
addresses.
IPv6 Addressing
The 128-bit IPv6 address is written as eight 16-bit hexadecimal blocks separated by colons (:). This
is an example IPv6 address 2001:0db8:1a2b:0015:0000:0000:1a2f:0000.
IPv6 addresses can be abbreviated in two ways:
• Leading zeros in a block can be omitted. So 2001:0db8:1a2b:0015:0000:0000:1a2f:0000 can
be written as 2001:db8:1a2b:15:0:0:1a2f:0.
• Any number of consecutive blocks of zeros can be replaced by a double colon. A double colon can
only appear once in an IPv6 address. So 2001:0db8:0000:0000:1a2f:0000:0000:0015 can be
written as 2001:0db8::1a2f:0000:0000:0015, 2001:0db8:0000:0000:1a2f::0015,
2001:db8::1a2f:0:0:15 or 2001:db8:0:0:1a2f::15.
Prefix and Prefix Length
Similar to an IPv4 subnet mask, IPv6 uses an address prefix to represent the network address. An
IPv6 prefix length specifies how many most significant bits (start from the left) in the address
compose the network address. The prefix length is written as “/x” where x is a number. For
example,
2001:db8:1a2b:15::1a2f:0/32
means that the first 32 bits (2001:db8) is the subnet prefix.
Link-local Address
A link-local address uniquely identifies a device on the local network (the LAN). It is similar to a
“private IP address” in IPv4. You can have the same link-local address on multiple interfaces on a
device. A link-local unicast address has a predefined prefix of fe80::/10. The link-local unicast
address format is as follows.
Table 131 Link-local Unicast Address Format
1111 1110 10
Interface ID
10 bits
54 bits
64 bits
VMG4381-B10A User’s Guide
345
Appendix E IPv6
Global Address
A global address uniquely identifies a device on the Internet. It is similar to a “public IP address” in
IPv4. A global unicast address starts with a 2 or 3.
Unspecified Address
An unspecified address (0:0:0:0:0:0:0:0 or ::) is used as the source address when a device does
not have its own address. It is similar to “0.0.0.0” in IPv4.
Loopback Address
A loopback address (0:0:0:0:0:0:0:1 or ::1) allows a host to send packets to itself. It is similar to
“127.0.0.1” in IPv4.
Multicast Address
In IPv6, multicast addresses provide the same functionality as IPv4 broadcast addresses.
Broadcasting is not supported in IPv6. A multicast address allows a host to send packets to all hosts
in a multicast group.
Multicast scope allows you to determine the size of the multicast group. A multicast address has a
predefined prefix of ff00::/8. The following table describes some of the predefined multicast
addresses.
Table 132 Predefined Multicast Address
MULTICAST ADDRESS
DESCRIPTION
FF01:0:0:0:0:0:0:1
All hosts on a local node.
FF01:0:0:0:0:0:0:2
All routers on a local node.
FF02:0:0:0:0:0:0:1
All hosts on a local connected link.
FF02:0:0:0:0:0:0:2
All routers on a local connected link.
FF05:0:0:0:0:0:0:2
All routers on a local site.
FF05:0:0:0:0:0:1:3
All DHCP severs on a local site.
The following table describes the multicast addresses which are reserved and can not be assigned
to a multicast group.
Table 133 Reserved Multicast Address
MULTICAST ADDRESS
FF00:0:0:0:0:0:0:0
FF01:0:0:0:0:0:0:0
FF02:0:0:0:0:0:0:0
FF03:0:0:0:0:0:0:0
FF04:0:0:0:0:0:0:0
FF05:0:0:0:0:0:0:0
FF06:0:0:0:0:0:0:0
FF07:0:0:0:0:0:0:0
VMG4381-B10A User’s Guide
346
Appendix E IPv6
Table 133 Reserved Multicast Address (continued)
MULTICAST ADDRESS
FF08:0:0:0:0:0:0:0
FF09:0:0:0:0:0:0:0
FF0A:0:0:0:0:0:0:0
FF0B:0:0:0:0:0:0:0
FF0C:0:0:0:0:0:0:0
FF0D:0:0:0:0:0:0:0
FF0E:0:0:0:0:0:0:0
FF0F:0:0:0:0:0:0:0
Subnet Masking
Both an IPv6 address and IPv6 subnet mask compose of 128-bit binary digits, which are divided
into eight 16-bit blocks and written in hexadecimal notation. Hexadecimal uses four bits for each
character (1 ~ 10, A ~ F). Each block’s 16 bits are then represented by four hexadecimal
characters. For example, FFFF:FFFF:FFFF:FFFF:FC00:0000:0000:0000.
Interface ID
In IPv6, an interface ID is a 64-bit identifier. It identifies a physical interface (for example, an
Ethernet port) or a virtual interface (for example, the management IP address for a VLAN). One
interface should have a unique interface ID.
EUI-64
The EUI-64 (Extended Unique Identifier) defined by the IEEE (Institute of Electrical and Electronics
Engineers) is an interface ID format designed to adapt with IPv6. It is derived from the 48-bit (6byte) Ethernet MAC address as shown next. EUI-64 inserts the hex digits fffe between the third and
fourth bytes of the MAC address and complements the seventh bit of the first byte of the MAC
address. See the following example.
MAC
EUI-64
02
00
: 13
: 49
: 12
: 34
: 56
: 13
: 49
: FF
: FE
: 12
: 34
: 56
Identity Association
An Identity Association (IA) is a collection of addresses assigned to a DHCP client, through which
the server and client can manage a set of related IP addresses. Each IA must be associated with
exactly one interface. The DHCP client uses the IA assigned to an interface to obtain configuration
from a DHCP server for that interface. Each IA consists of a unique IAID and associated IP
information.
The IA type is the type of address in the IA. Each IA holds one type of address. IA_NA means an
identity association for non-temporary addresses and IA_TA is an identity association for temporary
addresses. An IA_NA option contains the T1 and T2 fields, but an IA_TA option does not. The
DHCPv6 server uses T1 and T2 to control the time at which the client contacts with the server to
extend the lifetimes on any addresses in the IA_NA before the lifetimes expire. After T1, the client
sends the server (S1) (from which the addresses in the IA_NA were obtained) a Renew message. If
VMG4381-B10A User’s Guide
347
Appendix E IPv6
the time T2 is reached and the server does not respond, the client sends a Rebind message to any
available server (S2). For an IA_TA, the client may send a Renew or Rebind message at the client's
discretion.
T2
T1
Renew Renew
to S1
to S1
Renew Renew
to S1
to S1
Renew
to S1
Renew
to S1
Rebind
to S2
Rebind
to S2
DHCP Relay Agent
A DHCP relay agent is on the same network as the DHCP clients and helps forward messages
between the DHCP server and clients. When a client cannot use its link-local address and a wellknown multicast address to locate a DHCP server on its network, it then needs a DHCP relay agent
to send a message to a DHCP server that is not attached to the same network.
The DHCP relay agent can add the remote identification (remote-ID) option and the interface-ID
option to the Relay-Forward DHCPv6 messages. The remote-ID option carries a user-defined string,
such as the system name. The interface-ID option provides slot number, port information and the
VLAN ID to the DHCPv6 server. The remote-ID option (if any) is stripped from the Relay-Reply
messages before the relay agent sends the packets to the clients. The DHCP server copies the
interface-ID option from the Relay-Forward message into the Relay-Reply message and sends it to
the relay agent. The interface-ID should not change even after the relay agent restarts.
Prefix Delegation
Prefix delegation enables an IPv6 router to use the IPv6 prefix (network address) received from the
ISP (or a connected uplink router) for its LAN. The Device uses the received IPv6 prefix (for
example, 2001:db2::/48) to generate its LAN IP address. Through sending Router Advertisements
(RAs) regularly by multicast, the Device passes the IPv6 prefix information to its LAN hosts. The
hosts then can use the prefix to generate their IPv6 addresses.
ICMPv6
Internet Control Message Protocol for IPv6 (ICMPv6 or ICMP for IPv6) is defined in RFC 4443.
ICMPv6 has a preceding Next Header value of 58, which is different from the value used to identify
ICMP for IPv4. ICMPv6 is an integral part of IPv6. IPv6 nodes use ICMPv6 to report errors
encountered in packet processing and perform other diagnostic functions, such as "ping".
Neighbor Discovery Protocol (NDP)
The Neighbor Discovery Protocol (NDP) is a protocol used to discover other IPv6 devices and track
neighbor’s reachability in a network. An IPv6 device uses the following ICMPv6 messages types:
• Neighbor solicitation: A request from a host to determine a neighbor’s link-layer address (MAC
address) and detect if the neighbor is still reachable. A neighbor being “reachable” means it
responds to a neighbor solicitation message (from the host) with a neighbor advertisement
message.
VMG4381-B10A User’s Guide
348
Appendix E IPv6
• Neighbor advertisement: A response from a node to announce its link-layer address.
• Router solicitation: A request from a host to locate a router that can act as the default router and
forward packets.
• Router advertisement: A response to a router solicitation or a periodical multicast advertisement
from a router to advertise its presence and other parameters.
IPv6 Cache
An IPv6 host is required to have a neighbor cache, destination cache, prefix list and default router
list. The Device maintains and updates its IPv6 caches constantly using the information from
response messages. In IPv6, the Device configures a link-local address automatically, and then
sends a neighbor solicitation message to check if the address is unique. If there is an address to be
resolved or verified, the Device also sends out a neighbor solicitation message. When the Device
receives a neighbor advertisement in response, it stores the neighbor’s link-layer address in the
neighbor cache. When the Device uses a router solicitation message to query for a router and
receives a router advertisement message, it adds the router’s information to the neighbor cache,
prefix list and destination cache. The Device creates an entry in the default router list cache if the
router can be used as a default router.
When the Device needs to send a packet, it first consults the destination cache to determine the
next hop. If there is no matching entry in the destination cache, the Device uses the prefix list to
determine whether the destination address is on-link and can be reached directly without passing
through a router. If the address is unlink, the address is considered as the next hop. Otherwise, the
Device determines the next-hop from the default router list or routing table. Once the next hop IP
address is known, the Device looks into the neighbor cache to get the link-layer address and sends
the packet when the neighbor is reachable. If the Device cannot find an entry in the neighbor cache
or the state for the neighbor is not reachable, it starts the address resolution process. This helps
reduce the number of IPv6 solicitation and advertisement messages.
Multicast Listener Discovery
The Multicast Listener Discovery (MLD) protocol (defined in RFC 2710) is derived from IPv4's
Internet Group Management Protocol version 2 (IGMPv2). MLD uses ICMPv6 message types, rather
than IGMP message types. MLDv1 is equivalent to IGMPv2 and MLDv2 is equivalent to IGMPv3.
MLD allows an IPv6 switch or router to discover the presence of MLD listeners who wish to receive
multicast packets and the IP addresses of multicast groups the hosts want to join on its network.
MLD snooping and MLD proxy are analogous to IGMP snooping and IGMP proxy in IPv4.
MLD filtering controls which multicast groups a port can join.
MLD Messages
A multicast router or switch periodically sends general queries to MLD hosts to update the multicast
forwarding table. When an MLD host wants to join a multicast group, it sends an MLD Report
message for that address.
An MLD Done message is equivalent to an IGMP Leave message. When an MLD host wants to leave
a multicast group, it can send a Done message to the router or switch. The router or switch then
sends a group-specific query to the port on which the Done message is received to determine if
other devices connected to this port should remain in the group.
VMG4381-B10A User’s Guide
349
Appendix E IPv6
Example - Enabling IPv6 on Windows XP/2003/Vista
By default, Windows XP and Windows 2003 support IPv6. This example shows you how to use the
ipv6 install command on Windows XP/2003 to enable IPv6. This also displays how to use the
ipconfig command to see auto-generated IP addresses.
C:\>ipv6 install
Installing...
Succeeded.
C:\>ipconfig
Windows IP Configuration
Ethernet adapter Local Area Connection:
Connection-specific
IP Address. . . . .
Subnet Mask . . . .
IP Address. . . . .
Default Gateway . .
DNS
. .
. .
. .
. .
Suffix
. . . .
. . . .
. . . .
. . . .
10.1.1.46
255.255.255.0
fe80::2d0:59ff:feb8:103c%4
10.1.1.254
IPv6 is installed and enabled by default in Windows Vista. Use the ipconfig command to check
your automatic configured IPv6 address as well. You should see at least one IPv6 address available
for the interface on your computer.
Example - Enabling DHCPv6 on Windows XP
Windows XP does not support DHCPv6. If your network uses DHCPv6 for IP address assignment,
you have to additionally install a DHCPv6 client software on your Windows XP. (Note: If you use
static IP addresses or Router Advertisement for IPv6 address assignment in your network, ignore
this section.)
This example uses Dibbler as the DHCPv6 client. To enable DHCPv6 client on your computer:
Install Dibbler and select the DHCPv6 client option on your computer.
After the installation is complete, select Start > All Programs > Dibbler-DHCPv6 > Client
Install as service.
Select Start > Control Panel > Administrative Tools > Services.
Double click Dibbler - a DHCPv6 client.
VMG4381-B10A User’s Guide
350
Appendix E IPv6
Click Start and then OK.
Now your computer can obtain an IPv6 address from a DHCPv6 server.
Example - Enabling IPv6 on Windows 7
Windows 7 supports IPv6 by default. DHCPv6 is also enabled when you enable IPv6 on a Windows 7
computer.
To enable IPv6 in Windows 7:
Select Control Panel > Network and Sharing Center > Local Area Connection.
Select the Internet Protocol Version 6 (TCP/IPv6) checkbox to enable it.
Click OK to save the change.
VMG4381-B10A User’s Guide
351
Appendix E IPv6
Click Close to exit the Local Area Connection Status screen.
Select Start > All Programs > Accessories > Command Prompt.
Use the ipconfig command to check your dynamic IPv6 address. This example shows a global
address (2001:b021:2d::1000) obtained from a DHCP server.
C:\>ipconfig
Windows IP Configuration
Ethernet adapter Local Area Connection:
Connection-specific DNS
IPv6 Address. . . . . .
Link-local IPv6 Address
IPv4 Address. . . . . .
Subnet Mask . . . . . .
Default Gateway . . . .
Suffix
. . . .
. . . .
. . . .
. . . .
. . . .
2001:b021:2d::1000
fe80::25d8:dcab:c80a:5189%11
172.16.100.61
255.255.255.0
fe80::213:49ff:feaa:7125%11
172.16.100.254
VMG4381-B10A User’s Guide
352
A PPENDIX
Services
The following table lists some commonly-used services and their associated protocols and port
numbers.
• Name: This is a short, descriptive name for the service. You can use this one or create a
different one, if you like.
• Protocol: This is the type of IP protocol used by the service. If this is TCP/UDP, then the service
uses the same port number with TCP and UDP. If this is USER-DEFINED, the Port(s) is the IP
protocol number, not the port number.
• Port(s): This value depends on the Protocol.
• If the Protocol is TCP, UDP, or TCP/UDP, this is the IP port number.
• If the Protocol is USER, this is the IP protocol number.
• Description: This is a brief explanation of the applications that use this service or the situations
in which this service is used.
VMG4381-B10A User’s Guide
353
Appendix F Services
Table 134 Examples of Services
NAME
PROTOCOL
PORT(S)
DESCRIPTION
AH (IPSEC_TUNNEL) User-Defined
51
The IPSEC AH (Authentication Header)
tunneling protocol uses this service.
AIM
TCP
5190
AOL’s Internet Messenger service.
AUTH
TCP
113
Authentication protocol used by some
servers.
BGP
TCP
179
Border Gateway Protocol.
BOOTP_CLIENT
UDP
68
DHCP Client.
BOOTP_SERVER
UDP
67
DHCP Server.
CU-SEEME
TCP/UDP
7648
TCP/UDP
24032
A popular videoconferencing solution from
White Pines Software.
DNS
TCP/UDP
53
Domain Name Server, a service that
matches web names (for instance
www.zyxel.com) to IP numbers.
ESP
(IPSEC_TUNNEL)
User-Defined
50
The IPSEC ESP (Encapsulation Security
Protocol) tunneling protocol uses this
service.
FINGER
TCP
79
Finger is a UNIX or Internet related
command that can be used to find out if a
user is logged on.
FTP
TCP
20
TCP
21
File Transfer Protocol, a program to enable
fast transfer of files, including large files
that may not be possible by e-mail.
H.323
TCP
1720
NetMeeting uses this protocol.
HTTP
TCP
80
Hyper Text Transfer Protocol - a client/
server protocol for the world wide web.
HTTPS
TCP
443
HTTPS is a secured http session often used
in e-commerce.
ICMP
User-Defined
Internet Control Message Protocol is often
used for diagnostic purposes.
ICQ
UDP
4000
This is a popular Internet chat program.
IGMP (MULTICAST)
User-Defined
Internet Group Multicast Protocol is used
when sending packets to a specific group
of hosts.
IKE
UDP
500
The Internet Key Exchange algorithm is
used for key distribution and management.
IMAP4
TCP
143
The Internet Message Access Protocol is
used for e-mail.
IMAP4S
TCP
993
This is a more secure version of IMAP4 that
runs over SSL.
IRC
TCP/UDP
6667
This is another popular Internet chat
program.
MSN Messenger
TCP
1863
Microsoft Networks’ messenger service
uses this protocol.
NetBIOS
TCP/UDP
137
TCP/UDP
138
The Network Basic Input/Output System is
used for communication between
computers in a LAN.
TCP/UDP
139
TCP/UDP
445
VMG4381-B10A User’s Guide
354
Appendix F Services
Table 134 Examples of Services (continued)
NAME
PROTOCOL
PORT(S)
DESCRIPTION
NEW-ICQ
TCP
5190
An Internet chat program.
NEWS
TCP
144
A protocol for news groups.
NFS
UDP
2049
Network File System - NFS is a client/
server distributed file service that provides
transparent file sharing for network
environments.
NNTP
TCP
119
Network News Transport Protocol is the
delivery mechanism for the USENET
newsgroup service.
PING
User-Defined
Packet INternet Groper is a protocol that
sends out ICMP echo requests to test
whether or not a remote host is reachable.
POP3
TCP
110
Post Office Protocol version 3 lets a client
computer get e-mail from a POP3 server
through a temporary connection (TCP/IP or
other).
POP3S
TCP
995
This is a more secure version of POP3 that
runs over SSL.
PPTP
TCP
1723
Point-to-Point Tunneling Protocol enables
secure transfer of data over public
networks. This is the control channel.
PPTP_TUNNEL (GRE) User-Defined
47
PPTP (Point-to-Point Tunneling Protocol)
enables secure transfer of data over public
networks. This is the data channel.
RCMD
TCP
512
Remote Command Service.
REAL_AUDIO
TCP
7070
A streaming audio service that enables real
time sound over the web.
REXEC
TCP
514
Remote Execution Daemon.
RLOGIN
TCP
513
Remote Login.
ROADRUNNER
TCP/UDP
1026
This is an ISP that provides services mainly
for cable modems.
RTELNET
TCP
107
Remote Telnet.
RTSP
TCP/UDP
554
The Real Time Streaming (media control)
Protocol (RTSP) is a remote control for
multimedia on the Internet.
SFTP
TCP
115
The Simple File Transfer Protocol is an old
way of transferring files between
computers.
SMTP
TCP
25
Simple Mail Transfer Protocol is the
message-exchange standard for the
Internet. SMTP enables you to move
messages from one e-mail server to
another.
SMTPS
TCP
465
This is a more secure version of SMTP that
runs over SSL.
SNMP
TCP/UDP
161
Simple Network Management Program.
SNMP-TRAPS
TCP/UDP
162
Traps for use with the SNMP (RFC:1215).
VMG4381-B10A User’s Guide
355
Appendix F Services
Table 134 Examples of Services (continued)
NAME
PROTOCOL
PORT(S)
DESCRIPTION
SQL-NET
TCP
1521
Structured Query Language is an interface
to access data on many different types of
database systems, including mainframes,
midrange systems, UNIX systems and
network servers.
SSDP
UDP
1900
The Simple Service Discovery Protocol
supports Universal Plug-and-Play (UPnP).
SSH
TCP/UDP
22
Secure Shell Remote Login Program.
STRM WORKS
UDP
1558
Stream Works Protocol.
SYSLOG
UDP
514
Syslog allows you to send system logs to a
UNIX server.
TACACS
UDP
49
Login Host Protocol used for (Terminal
Access Controller Access Control System).
TELNET
TCP
23
Telnet is the login and terminal emulation
protocol common on the Internet and in
UNIX environments. It operates over TCP/
IP networks. Its primary function is to
allow users to log into remote host
systems.
VDOLIVE
TCP
7000
UDP
userdefined
A videoconferencing solution. The UDP port
number is specified in the application.
VMG4381-B10A User’s Guide
356
A PPENDIX
Legal Information
Copyright
Copyright © 2014 by ZyXEL Communications Corporation.
The contents of this publication may not be reproduced in any part or as a whole, transcribed,
stored in a retrieval system, translated into any language, or transmitted in any form or by any
means, electronic, mechanical, magnetic, optical, chemical, photocopying, manual, or otherwise,
without the prior written permission of ZyXEL Communications Corporation.
Published by ZyXEL Communications Corporation. All rights reserved.
Disclaimer
ZyXEL does not assume any liability arising out of the application or use of any products, or
software described herein. Neither does it convey any license under its patent rights nor the patent
rights of others. ZyXEL further reserves the right to make changes in any products described herein
without notice. This publication is subject to change without notice.
Certifications
Federal Communications Commission (FCC) Interference Statement
The device complies with Part 15 of FCC rules. Operation is subject to the following two conditions:
• This device may not cause harmful interference.
• This device must accept any interference received, including interference that may cause
undesired operations.
This device has been tested and found to comply with the limits for a Class B digital device pursuant
to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against
harmful interference in a residential installation. This device generates, uses, and can radiate radio
frequency energy, and if not installed and used in accordance with the instructions, may cause
harmful interference to radio communications. However, there is no guarantee that interference will
not occur in a particular installation.
If this device does cause harmful interference to radio/television reception, which can be
determined by turning the device off and on, the user is encouraged to try to correct the
interference by one or more of the following measures:
Reorient or relocate the receiving antenna.
Increase the separation between the equipment and the receiver.
VMG4381-B10A User’s Guide
357
Appendix G Legal Information
Connect the equipment into an outlet on a circuit different from that to which the receiver is
connected.
Consult the dealer or an experienced radio/TV technician for help.
FCC Radiation Exposure Statement
• This transmitter must not be co-located or operating in conjunction with any other antenna or
transmitter.
• IEEE 802.11b or 802.11g operation of this product in the U.S.A. is firmware-limited to channels 1
through 11.
• To comply with FCC RF exposure compliance requirements, a separation distance of at least 20
cm must be maintained between the antenna of this device and all persons.
注意 !
依據
低功率電波輻射性電機管理辦法
第十二條 經型式認證合格之低功率射頻電機，非經許可，公司、商號或使用
者均不得擅自變更頻率、加大功率或變更原設計之特性及功能。
第十四條 低功率射頻電機之使用不得影響飛航安全及干擾合法通信；經發現
有干擾現象時，應立即停用，並改善至無干擾時方得繼續使用。
前項合法通信，指依電信規定作業之無線電信。低功率射頻電機須忍
受合法通信或工業、科學及醫療用電波輻射性電機設備之干擾。
本機限在不干擾合法電臺與不受被干擾保障條件下於室內使用。
減少電磁波影響，請妥適使用。
Notices
Changes or modifications not expressly approved by the party responsible for compliance could
void the user's authority to operate the equipment.
This device has been designed for the WLAN 2.4 GHz network throughout the EC region and
Switzerland, with restrictions in France.
Ce produit est conçu pour les bandes de fréquences 2,4 GHz et/ou 5 GHz conformément à la
législation Européenne. En France métropolitaine, suivant les décisions n°03-908 et 03-909 de
l’ARCEP, la puissance d’émission ne devra pas dépasser 10 mW (10 dB) dans le cadre d’une
installation WiFi en extérieur pour les fréquences comprises entre 2454 MHz et 2483,5 MHz.
This Class [*] digital apparatus complies with Canadian ICES-003.
Cet appareil numérique de la classe [*] est conforme à la norme NMB-003 du Canada.
ZyXEL Limited Warranty
ZyXEL warrants to the original end user (purchaser) that this product is free from any defects in
materials or workmanship for a period of up to two years from the date of purchase. During the
VMG4381-B10A User’s Guide
358
Appendix G Legal Information
warranty period, and upon proof of purchase, should the product have indications of failure due to
faulty workmanship and/or materials, ZyXEL will, at its discretion, repair or replace the defective
products or components without charge for either parts or labor, and to whatever extent it shall
deem necessary to restore the product or components to proper operating condition. Any
replacement will consist of a new or re-manufactured functionally equivalent product of equal or
higher value, and will be solely at the discretion of ZyXEL. This warranty shall not apply if the
product has been modified, misused, tampered with, damaged by an act of God, or subjected to
abnormal working conditions.
Note
Repair or replacement, as provided under this warranty, is the exclusive remedy of the purchaser.
This warranty is in lieu of all other warranties, express or implied, including any implied warranty of
merchantability or fitness for a particular use or purpose. ZyXEL shall in no event be held liable for
indirect or consequential damages of any kind to the purchaser.
To obtain the services of this warranty, contact ZyXEL's Service Center for your Return Material
Authorization number (RMA). Products must be returned Postage Prepaid. It is recommended that
the unit be insured when shipped. Any returned products without proof of purchase or those with
an out-dated warranty will be repaired or replaced (at the discretion of ZyXEL) and the customer
will be billed for parts and labor. All repaired or replaced products will be shipped by ZyXEL to the
corresponding return address, Postage Paid. This warranty gives you specific legal rights, and you
may also have other rights that vary from country to country.
Registration
Register your product online to receive e-mail notices of firmware upgrades and information at
www.zyxel.com for global products, or at www.us.zyxel.com for North American products.
Safety Warnings
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
Do NOT use this product near water, for example, in a wet basement or near a swimming pool.
Do NOT expose your device to dampness, dust or corrosive liquids.
Do NOT store things on the device.
Do NOT install, use, or service this device during a thunderstorm. There is a remote risk of electric shock from lightning.
Connect ONLY suitable accessories to the device.
Do NOT open the device or unit. Opening or removing covers can expose you to dangerous high voltage points or other risks. ONLY
qualified service personnel should service or disassemble this device. Please contact your vendor for further information.
Make sure to connect the cables to the correct ports.
Place connecting cables carefully so that no one will step on them or stumble over them.
Always disconnect all cables from this device before servicing or disassembling.
Use ONLY an appropriate power adaptor or cord for your device.
Connect the power adaptor or cord to the right supply voltage (for example, 110V AC in North America or 230V AC in Europe).
Do NOT allow anything to rest on the power adaptor or cord and do NOT place the product where anyone can walk on the power
adaptor or cord.
Do NOT use the device if the power adaptor or cord is damaged as it might cause electrocution.
If the power adaptor or cord is damaged, remove it from the device and the power source.
Do NOT attempt to repair the power adaptor or cord. Contact your local vendor to order a new one.
Do not use the device outside, and make sure all the connections are indoors. There is a remote risk of electric shock from lightning.
Do NOT obstruct the device ventilation slots, as insufficient airflow may harm your device.
Use only No. 26 AWG (American Wire Gauge) or larger telecommunication line cord.
Antenna Warning! This device meets ETSI and FCC certification requirements when using the included antenna(s). Only use the
included antenna(s).
This product is for indoor use only (utilisation intérieure exclusivement).
The screen of the coaxial cable is intended to be connected to earth in the building installation.
Your product is marked with this symbol, which is known as the WEEE mark. WEEE stands for Waste Electronics and Electrical
Equipment. It means that used electrical and electronic products should not be mixed with general waste. Used electrical and
electronic equipment should be treated separately.
VMG4381-B10A User’s Guide
359
Appendix G Legal Information
VMG4381-B10A User’s Guide
360
Index
Index
example 123
ACL rule 218
ACS 263
activation
firewalls 215
media server 211
SIP ALG 190
SSID 110
CA 233, 337
Canonical Format Indicator See CFI
CCMs 282
certificate
factory default 234
adding a printer example 62
Address Resolution Protocol 249
Certificate Authority
See CA.
administrator password 26
alternative subnet mask notation 317
certificates 233
authentication 233
CA
creating 234
public key 233
replacing 234
storage space 234
antenna
directional 343
gain 342
omni-directional 343
AP (access point) 333
applications
Internet access 18
media server 210
activation 211
iTunes server 210
Certification Authority 233
Certification Authority. see CA
certifications 357
notices 358
applications, NAT 194
CFI 99
ARP Table 249, 251
CFM 282
CCMs 282
link trace test 282
loopback test 282
MA 282
MD 282
MEP 282
MIP 282
authentication 120, 121
RADIUS server 121
Auto Configuration Server, see ACS 263
channel 333
interference 333
backup
configuration 279
channel, wireless LAN 119
Basic Service Set, See BSS 331
client list 138
Basic Service Set, see BSS
compatibility, WDS 114
blinking LEDs 21
configuration
backup 279
firewalls 215
reset 280
Broadband 75
broadcast 99
BSS 123, 331
VMG4381-B10A User’s Guide
361
Index
restoring 280
static route 96, 158, 198
Connectivity Check Messages, see CCMs
EAP Authentication 337
copyright 357
ECHO 195
CoS 176
e-mail
log example 274
CoS technologies 164
creating certificates 234
Encapsulation 96
MER 97
PPP over Ethernet 97
CTS (Clear to Send) 334
CTS threshold 117, 120
encapsulation 76
encryption 122, 339
ESS 332
Extended Service Set IDentification 104, 111
Extended Service Set, See ESS 332
data fragment threshold 117, 120
DDoS 214
default server address 189
Denials of Service, see DoS
DHCP 134, 153
Differentiated Services, see DiffServ 176
FCC interference statement 357
DiffServ 176
marking rule 177
File Sharing 208
digital IDs 233
disclaimer 357
filters
MAC address 111, 121
DLNA 210
Finger 195
DMZ 189
firewalls 213
add protocols 215
configuration 215
DDoS 214
DoS 214
LAND attack 214
Ping of Death 214
SYN attack 214
file sharing 20
DNS 134, 154
DNS server address assignment 99
Domain Name 195
Domain Name System, see DNS
Domain Name System. See DNS.
DoS 214
DS, dee differentiated services
firmware 277
version 73
DSCP 176
forwarding ports 182
dynamic DNS 197
wildcard 198
fragmentation threshold 117, 120, 334
DS field 176
FTP 182, 195
Dynamic Host Configuration Protocol, see DHCP
dynamic WEP key exchange 338
DYNDNS wildcard 198
General wireless LAN screen 102
VMG4381-B10A User’s Guide
362
Index
Neighbor Discovery Protocol 345
ping 345
prefix 77, 100, 345
prefix delegation 79
prefix length 77, 100, 345
unspecified address 346
hidden node 333
HTTP 195
ISP 76
iTunes server 210
IANA 322
Internet Assigned Numbers Authority
see IANA
IBSS 331
LAN 133
client list 138
DHCP 134, 153
DNS 134, 154
IP address 134, 135, 154
MAC address 139
status 73
subnet mask 134, 135, 154
IEEE 802.11g 335
IEEE 802.1Q 98
IGA 193
IGMP 99
multicast group list 253
version 99
ILA 193
Independent Basic Service Set
See IBSS 331
LAND attack 214
initialization vector (IV) 339
LBR 282
Inside Global Address, see IGA
limitations
wireless LAN 122
WPS 130
LAN-Side DSL CPE Configuration 265
Inside Local Address, see ILA
interface group 201
Internet
wizard setup 33
link trace 282
Internet access 18
wizard setup 33
Link Trace Response, see LTR
Link Trace Message, see LTM
Internet Protocol version 6 77
login 25
passwords 25, 26
Internet Protocol version 6, see IPv6
logs 241, 245, 253, 273
Internet Service Provider, see ISP
Loop Back Response, see LBR
IP address 134, 154
ping 283
private 155
WAN 76
loopback 282
LTM 282
LTR 282
IP Address Assignment 98
IP alias
NAT applications 195
IPv6 77, 345
addressing 77, 100, 345
EUI-64 347
global address 346
interface ID 347
link-local address 345
MA 282
MAC address 112, 139
filter 111, 121
MAC authentication 111
Mac filter 224
VMG4381-B10A User’s Guide
363
Index
Maintenance Association, see MA
Maintenance Domain, see MD
Maintenance End Point, see MEP
Pairwise Master Key (PMK) 339, 341
managing the device
good habits 17
passwords 25, 26
PBC 125
MBSSID 123
Per-Hop Behavior, see PHB 177
MD 282
PHB 177
media server 210
activation 211
iTunes server 210
PIN, WPS 125
example 127
Ping of Death 214
MEP 282
Point-to-Point Tunneling Protocol 195
MoCA 151
POP3 195
MTU (Multi-Tenant Unit) 98
port forwarding 182
multicast 99
ports 21
Multiple BSS, see MBSSID
PPP over Ethernet, see PPPoE
PPPoE 76, 97
Benefits 97
PPTP 195
preamble 117, 120
NAT 181, 183, 192, 193, 321
applications 194
IP alias 195
example 194
global 193
IGA 193
ILA 193
inside 193
local 193
outside 193
port forwarding 182
port number 195
services 195
SIP ALG 190
activation 190
preamble mode 124
prefix delegation 79
Printer Server 211
printer sharing 62
configuration 62
requirements 211
private IP address 155
product registration 359
protocol 76
PSK 339
push button 23
Push Button Configuration, see PBC
push button, WPS 125
NAT example 196
Network Address Translation
see NAT
Network Address Translation, see NAT
QoS 163, 176
marking 164
setup 163
tagging 164
versus CoS 164
Network Map 71
network map 29
NNTP 195
Quality of Service, see QoS
VMG4381-B10A User’s Guide
364
Index
SNMP 195
RADIUS 336
message types 336
messages 336
shared secret key 337
SPI 214
SNMP trap 195
srTCM 178
SSID 121
activation 110
MBSSID 123
RADIUS server 121
registration
product 359
static route 157, 271
configuration 96, 158, 198
example 157
related documentation 2
static VLAN
remote management
TR-069 263
status 71
firmware version 73
LAN 73
WAN 73
wireless LAN 73
Remote Procedure Calls, see RPCs 263
reset 22, 280
restart 281
restoring configuration 280
status indicators 21
RFC 1058. See RIP.
subnet 315
RFC 1389. See RIP.
subnet mask 134, 154, 316
RFC 3164 241
subnetting 318
RIP 161
SYN attack 214
router features 18
syslog
protocol 241
severity levels 241
Routing Information Protocol. See RIP
RPPCs 263
RTS (Request To Send) 334
threshold 333, 334
system
firmware 277
version 73
passwords 25, 26
reset 22
status 71
LAN 73
WAN 73
wireless LAN 73
time 267
RTS threshold 117, 120
security
wireless LAN 120
Security Log 243
Security Parameter Index, see SPI
service access control 261
Service Set 104, 111
Services 195
Tag Control Information See TCI
setup
firewalls 215
static route 96, 158, 198
Tag Protocol Identifier See TPID
TCI
TFTP 152
Single Rate Three Color Marker, see srTCM
The 76
SIP ALG 190
activation 190
thresholds
data fragment 117, 120
RTS/CTS 117, 120
SMTP 195
VMG4381-B10A User’s Guide
365
Index
time 267
compatibility 114
example 124
TPID 98
web configurator 25
login 25
passwords 25, 26
TR-064 265
TR-069 263
ACS setup 263
authentication 264
WEP 122
trTCM 179
WEP Encryption 106, 107
Two Rate Three Color Marker, see trTCM
WEP encryption 105
WEP key 105
Wi-Fi Protected Access 338
wireless client WPA supplicants 340
unicast 99
wireless LAN 101, 118
authentication 120, 121
BSS 123
example 123
channel 119
encryption 122
example 119
fragmentation threshold 117, 120
limitations 122
MAC address filter 111, 121
MBSSID 123
preamble 117, 120
RADIUS server 121
RTS/CTS threshold 117, 120
security 120
SSID 121
activation 110
status 73
WDS 114, 124
compatibility 114
example 124
WEP 122
WPA 122
WPA-PSK 122
WPS 124, 127
example 128
limitations 130
PIN 125
push button 23, 125
Wireless Distribution System, see WDS
Universal Plug and Play, see UPnP
upgrading firmware 277
UPnP 140
cautions 135
example 141
installation 141
NAT traversal 134
USB features 20
VID
Virtual Local Area Network See VLAN
VLAN 98
Introduction 98
number of possible VIDs
priority frame
static
VLAN ID 98
VLAN Identifier See VID
VLAN tag 98
wireless security 335
WAN
status 73
Wide Area Network, see WAN 75
Wireless tutorial 40
warranty
note 359
WLAN
interference 333
security parameters 342
wizard setup
Internet 33
WDS 114, 124
VMG4381-B10A User’s Guide
366
Index
WPA 122, 338
key caching 340
pre-authentication 340
user authentication 339
vs WPA-PSK 339
wireless client supplicant 340
with RADIUS application example 340
WPA2 338
user authentication 339
vs WPA2-PSK 339
wireless client supplicant 340
with RADIUS application example 340
WPA2-Pre-Shared Key 339
WPA2-PSK 339
application example 341
WPA-PSK 122, 339
application example 341
WPS 124, 127
example 128
limitations 130
PIN 125
example 127
push button 23, 125
VMG4381-B10A User’s Guide
367
Index
VMG4381-B10A User’s Guide
368
Index
VMG4381-B10A User’s Guide
369
Index
VMG4381-B10A User’s Guide
370
Source Exif Data: 
File Type                       : PDF
File Type Extension             : pdf
MIME Type                       : application/pdf
PDF Version                     : 1.4
Linearized                      : No
Page Count                      : 220
Producer                        : PDF Editor 2.2 - Foxit Software
Author                          : ZT01948
Create Date                     : 2014:05:20 15:08:54
Modify Date                     : 2014:05:20 15:08:54

EXIF Metadata provided by EXIF.tools
FCC ID Filing: I88VMG4381B10A
 




Navigation menu